Submission #2236577

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Source Code Expand

#include <cstdio>

int main(void){
  int  a[4];
  char in[5], ans[10];
  scanf("%s", in);
  for (int i=0; i<4; i++){
    a[i] = in[i] - '0';
  }
  sprintf(ans, "%d %d %d %d=7", a[0],a[1],a[2],a[3]);
  for (int i=0; i < 1<<3; i++){
    int sum = a[0];
    for (int j=0; j<3; j++){
      if (i & 1<<j){
        sum += a[j+1];
        ans[j*2+1] = '+';
      } else {
        sum -= a[j+1];
        ans[j*2+1] = '-';
      }
    }
    if (sum == 7){
      puts(ans);
      i = 1<<3; // finish search
    }
  }
  
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:6:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s", in);
                  ^

Judge Result