struct fastio{
char s[100005];
int it,len;
fastio(){it=len=0;}
inline char get(){
if(it<len)return s[it++];it=0;
len=fread(s,1,100000,stdin);
if(len==0)return EOF;else return s[it++];
}
bool notend(){
char c=get();
while(c==' '||c=='
')c=get();
if(it>0)it--;
return c!=EOF;
}
}_buff;
#define read(x) x=getnum()
#define write(x) putnum(x),putchar('
')
inline LL getnum(){
LL r=0;bool ng=0;char c;c=_buff.get();
while(c!='-'&&(c<'0'||c>'9'))c=_buff.get();
if(c=='-')ng=1,c=_buff.get();
while(c>='0'&&c<='9')r=r*10+c-'0',c=_buff.get();
return ng?-r:r;
}
template<class T> inline void putnum(T x){
if(x<0)putchar('-'),x=-x;
register short a[20]={},sz=0;
while(x)a[sz++]=x%10,x/=10;
if(sz==0)putchar('0');
for(int i=sz-1;i>=0;i--)putchar('0'+a[i]);
}
inline char getreal(){char c=_buff.get();while(c<=32)c=_buff.get();return c;}
常用头文件：
g++ -std=c++14 A.cpp -o A -D LH_LOCAL
/*
**链接**
传送门: [here]()
**题意**
**思路**
**备注**
*/
#pragma comment(linker, "/STACK:102400000,102400000")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize(3,"Ofast","inline")
#pragma GCC optimize("Ofast,no-stack-protector")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
#define fi first
#define se second
#define o2(x) (x) * (x)
#define mk make_pair
#define eb emplace_back
#define SZ(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()
#define clr(a, b) memset((a), (b), sizeof((a)))
#define rep(i, s, t) for(register int i = (s), LIM=(t); i < LIM; ++i)
#define per(i, s, t) for(register int i = (s), LIM=(t); i >= LIM; --i)
#define GKD std::ios::sync_with_stdio(false);cin.tie(0)
#define my_unique(x) sort(all(x)), x.erase(unique(all(x)), x.end())
using namespace std;
typedef long long LL;
typedef long long int64;
typedef unsigned long long uint64;
typedef pair<int, int> pii;
// mt19937 rng(time(NULL));//std::clock()
// mt19937_64 rng64(chrono::steady_clock::now().time_since_epoch().count());
// shuffle(arr, arr + n, rng64);
inline int64 read() {
int64 x = 0;int f = 0;char ch = getchar();
while (ch < '0' || ch > '9') f |= (ch == '-'), ch = getchar();
while (ch >= '0' && ch <= '9') x = (x << 3) + (x << 1) + ch - '0', ch =
getchar(); return x = f ? -x : x;
}
inline void write(int64 x, bool f = true) {
if (x == 0) {putchar('0'); if(f)putchar('
');else putchar(' ');return;}
if (x < 0) {putchar('-');x = -x;}
static char s[23];
int l = 0;
while (x != 0)s[l++] = x % 10 + 48, x /= 10;
while (l)putchar(s[--l]);
if(f)putchar('
');else putchar(' ');
}
int lowbit(int x) { return x & (-x); }
template <class T>
T big(const T &a1, const T &a2) {return a1 > a2 ? a1 : a2;}
template <class T>
T sml(const T &a1, const T &a2) {return a1 < a2 ? a1 : a2;}
template <typename T, typename... R>
T big(const T &f, const R &... r) {return big(f, big(r...));}
template <typename T, typename... R>
T sml(const T &f, const R &... r) {return sml(f, sml(r...));}
void debug_out() { cout << '
'; }
template <typename T, typename... R>
void debug_out(const T &f, const R &... r) {
cout << f << " ";
debug_out(r...);
}
#ifdef LH_LOCAL
#define debug(...) cout << "[" << #__VA_ARGS__ << "]: ", debug_out(__VA_ARGS__);
#else
#define debug(...) ;
#endif
/*================Header Template==============*/
const int mod = 998244353;// 998244353
const int INF = 0x3f3f3f3f;
int ksm(int a, int64 b, int kmod = mod) {int res = 1;for(;b > 0;b >>= 1, a = (int64)a * a % kmod) if(b &1) res = (int64)res * a % kmod;return res;}
const int MXN = 2e5 + 5;
int n, m;
void work() {
n = read();
}
int main() {
#ifdef LH_LOCAL
freopen("D:/ACM/mtxt/in.txt", "r", stdin);
// freopen("D:/ACM/mtxt/out.txt", "w", stdout);
#endif
for(int cas = 1, tim = 1; cas <= tim; ++ cas) {
// printf("Case #%d:
", cas);
work();
}
#ifdef LH_LOCAL
cout << "time cost:" << 1.0 * clock() / CLOCKS_PER_SEC << "s" << endl;
#endif
return 0;
}
vscode snippets
{
// Place your snippets for cpp here. Each snippet is defined under a snippet name and has a prefix, body and
// description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the
// same ids are connected.
// Example:
// "Print to console": {
// "prefix": "log",
// "body": [
// "console.log('$1');",
// "$2"
// ],
// "description": "Log output to console"
// },
"简单线段树模板": {
"prefix": "mb_seg1",
"body": [
"class SegT1 {",
" public:",
"#define lson rt << 1",
"#define rson rt << 1 | 1",
" int N;",
" vector<int> lazy;",
" vector<int64_t> sum;",
" SegT1(int N = 0) : N(N), lazy((N << 2) + 5), sum((N << 2) + 5) {}",
" void pop(int rt) {",
" sum[rt] = (sum[lson] + sum[rson]);",
" }",
" void build(int l, int r, int rt) {",
" lazy[rt] = 0;",
" if(l == r) {",
" sum[rt] = 1;",
" return ;",
" }",
" int mid = (l + r) >> 1;",
" build(l, mid, lson), build(mid + 1, r, rson);",
" pop(rt);",
" }",
" void push(int rt, int l, int r) {",
" if(lazy[rt] == 0) return ;",
" int mid = (l + r) >> 1;",
" lazy[lson] += lazy[rt];",
" lazy[rson] += lazy[rt];",
" sum[lson] += lazy[rt] * (mid - l + 1);",
" sum[rson] += lazy[rt] * (r - mid);",
" lazy[rt] = 0;",
" }",
" void apply(int rt, int l, int r, int v) {",
" lazy[rt] += v;",
" sum[rt] += v * (r - l + 1);",
" }",
" void update(int v, int L, int R, int l, int r, int rt) {",
" if(L <= l && r <= R) {",
" apply(rt, l, r, v);",
" return ;",
" }",
" int mid = (l + r) >> 1;",
" push(rt, l, r);",
" if(L > mid) {update(v, L, R, mid + 1, r, rson);}",
" else if(R <= mid) {update(v, L, R, l, mid, lson);}",
" else {",
" update(v, L, mid, l, mid, lson);",
" update(v, mid + 1, R, mid + 1, r, rson);",
" }",
" pop(rt);",
" }",
" int query(int L, int R, int l, int r, int rt) {",
" if(L <= l && r <= R) {",
" return sum[rt];",
" }",
" int mid = (l + r) >> 1, ans = 0;",
" push(rt, l, r);",
" if(L > mid) {ans += query(L, R, mid + 1, r, rson);}",
" else if(R <= mid) {ans += query(L, R, l, mid, lson);}",
" else {",
" ans += query(L, mid, l, mid, lson);",
" ans + query(mid + 1, R, mid + 1, r, rson);",
" }",
" return ans;",
" pop(rt);",
" }",
"#undef lson",
"#undef rson",
"};",
],
"description": "简单线段树模板"
},
"freopen模板": {
"prefix": "mb_freopen",
"body": [
"#ifdef LH_LOCAL",
" freopen("D:/ACM/mtxt/in.txt", "r", stdin);",
" // freopen("D:/ACM/mtxt/out.txt", "w", stdout);",
"#endif",
],
"description": "freopen模板"
},
"头文件完整": {
"prefix": "mb_headfile1",
"body": [
"#include <bits/stdc++.h>",
"#define fi first",
"#define se second",
"#define o2(x) (x) * (x)",
"#define mk make_pair",
"#define eb emplace_back",
"#define SZ(x) ((int)(x).size())",
"#define all(x) (x).begin(), (x).end()",
"#define clr(a, b) memset((a), (b), sizeof((a)))",
"#define rep(i, s, t) for(register int i = (s), LIM=(t); i < LIM; ++i)",
"#define per(i, s, t) for(register int i = (s), LIM=(t); i >= LIM; --i)",
"#define GKD std::ios::sync_with_stdio(false);cin.tie(0)",
"#define my_unique(x) sort(all(x)), x.erase(unique(all(x)), x.end())",
"using namespace std;",
"typedef long long LL;",
"typedef long long int64;",
"typedef unsigned long long uint64;",
"typedef pair<int, int> pii;",
"// mt19937 rng(time(NULL));//std::clock()",
"// mt19937_64 rng64(chrono::steady_clock::now().time_since_epoch().count());",
"// shuffle(arr, arr + n, rng64);",
"inline int64 read() {",
" int64 x = 0;int f = 0;char ch = getchar();",
" while (ch < '0' || ch > '9') f |= (ch == '-'), ch = getchar();",
" while (ch >= '0' && ch <= '9') x = (x << 3) + (x << 1) + ch - '0', ch =",
" getchar(); return x = f ? -x : x;",
"}",
"inline void write(int64 x, bool f = true) {",
" if (x == 0) {putchar('0'); if(f)putchar('\n');else putchar(' ');return;}",
" if (x < 0) {putchar('-');x = -x;}",
" static char s[23];",
" int l = 0;",
" while (x != 0)s[l++] = x % 10 + 48, x /= 10;",
" while (l)putchar(s[--l]);",
" if(f)putchar('\n');else putchar(' ');",
"}",
"int lowbit(int x) { return x & (-x); }",
"template <class T>",
"T big(const T &a1, const T &a2) {return a1 > a2 ? a1 : a2;}",
"template <class T>",
"T sml(const T &a1, const T &a2) {return a1 < a2 ? a1 : a2;}",
"template <typename T, typename... R>",
"T big(const T &f, const R &... r) {return big(f, big(r...));}",
"template <typename T, typename... R>",
"T sml(const T &f, const R &... r) {return sml(f, sml(r...));}",
"void debug_out() { cout << '\n'; }",
"template <typename T, typename... R>",
"void debug_out(const T &f, const R &... r) {",
" cout << f << " ";",
" debug_out(r...);",
"}",
"#ifdef LH_LOCAL",
"#define debug(...) cout << "[" << #__VA_ARGS__ << "]: ", debug_out(__VA_ARGS__);",
"#else",
"#define debug(...) ;",
"#endif",
"/*================Header Template==============*/",
"const int mod = 998244353;// 998244353",
"const int INF = 0x3f3f3f3f;",
"int ksm(int a, int64 b, int kmod = mod) {int res = 1;for(;b > 0;b >>= 1, a = (int64)a * a % kmod) if(b &1) res = (int64)res * a % kmod;return res;}",
"const int MXN = 2e5 + 5;",
"",
"int n, m;",
"void work() {",
" n = read();",
"}",
"int main() {",
"#ifdef LH_LOCAL",
" freopen("D:/ACM/mtxt/in.txt", "r", stdin);",
" // freopen("D:/ACM/mtxt/out.txt", "w", stdout);",
"#endif",
" for(int cas = 1, tim = 1; cas <= tim; ++ cas) {",
" // printf("Case #%d:\n", cas);",
" work();",
" }",
"#ifdef LH_LOCAL",
" cout << "time cost:" << 1.0 * clock() / CLOCKS_PER_SEC << "s" << endl;",
"#endif",
" return 0;",
"}",
],
"description": "头文件完整"
},
"头文件部分": {
"prefix": "mb_headfile2",
"body": [
"#include <bits/stdc++.h>",
"using namespace std;",
"void debug_out() { cout << '\n'; }",
"template <typename T, typename... R>",
"void debug_out(const T &f, const R &... r) {",
" cout << f << " ";",
" debug_out(r...);",
"}",
"#ifndef ONLINE_JUDGE",
"#define debug(...) cout << "[" << #__VA_ARGS__ << "]: ", debug_out(__VA_ARGS__);",
"#else",
"#define debug(...) ;",
"#endif",
"typedef long long LL;",
"bool Finish_read;",
"inline long long Rd() {long long x = 0;Finish_read = 0;int f = 1;char ch = getchar();while (!isdigit(ch)) {if (ch == '-') f = -1;if (ch == EOF) return x;ch = getchar();}while (isdigit(ch)) x = x * 10 + ch - '0', ch = getchar();x *= f;Finish_read = 1;return x;}",
"template <class T>inline void print(T x) {if(x > 9) print(x / 10), putchar(x % 10 ^ 48);else if(x < 0) putchar('-'), print(-x);else putchar(x % 10 ^ 48);}",
"template <class T>inline void write(T x, char c = '\n') {print(x);putchar(c);}",
"#define read(x) x = Rd()",
"#define read2(x, y) x = Rd(), y = Rd()",
"#define read3(x, y, z) x = Rd(), y = Rd(), z = Rd()",
"",
"constexpr int mod = 998244353;",
"constexpr int INF = 0x3f3f3f3f;",
"constexpr int mxN = 2e5 + 5;",
"int n, m;",
"int ans;",
"void prework() {",
" read(n);",
" debug(n)",
"}",
"void work() {",
" ",
"}",
"void finalwork() {",
" write(n);",
"}",
"int main() {",
" for(int Case = 1, allc = 1; Case <= allc; ++ Case) {",
" prework();",
" work();",
" finalwork();",
" }",
" return 0;",
"}",
],
"description": "头文件部分"
},
}