随机生成数据以及测定时间

今天下午出题的时候用了一下这两个黑科技2333，真的很舒服。

随机生成数据代码

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int myrand(int mod) { return ((ll)rand()<<32^(ll)rand()<<16^rand())%mod; }
#define random(a, b)((a) + myrand((b) - (a) + 1)) //Integer[a,b]
int main(int argc, char *argv[]) {
    stringstream ss;
    int seed = time(NULL);
    if (argc) {
        ss << argv[1];
        ss >> seed;
    }
    srand(seed);
    for(int j=1;j<=;++j){
        int n = random(1, 10);
    int k = random(1, 1000);
    assert(1 <= n && n <= 100);
    assert(1 <= k && k <= 1000);
    printf("%d %d
", n, k);
    for (int i = 0; i < n; i++) {
        int tmp = random(1, 100);
        int tmp1=random(1,100);
        cout<<tmp<<" "<<tmp1<<endl;
    }
     printf("


");
    }
    return 0;
}

测定时间代码

clock_t start, end;
start = clock();
end = clock();
printf("run time: %lf
", (double)(end - start) / CLOCKS_PER_SEC);