题目： http://poj.org/problem?id=1416
又16ms 1A了，这人品。。。
1 #include <stdio.h> 2 #include <string.h> 3 4 int n, ans; 5 bool rejected; 6 char path[100], tmp[10], ans_path[100]; 7 8 void dfs(int sum, char s[]) 9 { 10 if(sum > n)return; 11 if(s[0] == ' ') 12 { 13 if(sum == ans)rejected = 1; 14 else if(sum > ans && sum <= n) 15 { 16 rejected = 0; 17 ans = sum; 18 strcpy(ans_path, path); 19 } 20 return; 21 } 22 int len = strlen(s); 23 for(int i = 1; i <= len; i++) 24 { 25 int x = s[0] - '0'; 26 for(int j = 1; j < i; j++) 27 x = x * 10 + s[j] - '0'; 28 int pathlen = strlen(path); 29 30 sprintf(path, "%s %d", path, x); 31 //也可以把上面一行写成下面这两行。上面的写法把自己打印到自己，与编译器有关。 32 //sprintf(tmp, " %d", x); 33 //strcat(path, tmp); 34 35 dfs(x+sum, &s[i]); 36 path[pathlen] = ' '; 37 } 38 } 39 40 int main() 41 { 42 char s[10]; 43 while(scanf("%d %s", &n, s) != EOF) 44 { 45 if(n == 0 && s[0] == '0')break; 46 ans = -1; 47 rejected = 0; 48 int len = strlen(s); 49 for(int i = 1; i <= len; i++) 50 { 51 int x = s[0] - '0'; 52 for(int j = 1; j < i; j++) 53 x = x * 10 + s[j] - '0'; 54 sprintf(path, "%d", x); 55 dfs(x, &s[i]); 56 } 57 if(ans == -1) 58 printf("error "); 59 else if(rejected) 60 printf("rejected "); 61 else 62 printf("%d %s ", ans, ans_path); 63 } 64 return 0; 65 }