Submission #3779856

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Source Code Expand

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <set>

#define NUM_OF_ALPHA 26

char s[27];
int used_alpha;

void next(){
  used_alpha = 0;
  int len = strlen(s);
  if(len != NUM_OF_ALPHA){
  	for(int i = 0; i < len; i++) {
      used_alpha |= (1 << (s[i]-'a'));
    }
    for(int i = 0; i < NUM_OF_ALPHA; i++) {
      if((used_alpha & (1 << i)) == 0) {
        s[len] = 'a' + i;
        s[len + 1] = 0;
        break;
      }
    }
  } else {
    int i;
    for(i = len - 2; i >= 0; i--) {
      if(s[i] < s[i + 1]){
        for(int k = 0; k < i; k++){
          used_alpha |= (1 << (s[k]-'a'));
        }
        for(int k = 0; k < NUM_OF_ALPHA; k++) {
          if((used_alpha & (1 << k)) == 0 && k > (s[i] - 'a')) {
            s[i] = 'a' + k;
            s[i + 1] = 0;
            break;
          }
        }
        break;
      }
    }
    if(i < 0){
      s[0] = '-';
      s[1] = '1';
      s[2] = 0;
    }
  }
}

int main(){
  scanf("%s", s);
  next();
  printf("%s\n", s);

  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:51:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s", s);
                 ^

Judge Result