Submission #3025011

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Source Code Expand

#define SIZE 100001

#include<stdio.h>

int main(){
  int N,M;
  int a[SIZE], b[SIZE];
  int group[SIZE][2];

  scanf("%d", &N);
  scanf("%d", &M);

  for(int i=0; i<M; i++){
    scanf("%d %d", &a[i], &b[i]);
  }

  group[0][0] = a[0];
  group[0][1] = b[0];

  int group_num = 1;
  int new_group_flag = 0;
  for(int i=1; i<M; i++){ //check subject i
    for(int j=0; j<group_num; j++){ //check group j
      if(a[i] < group[j][1] && group[j][0] < b[i]){ //subject i belongs to group j
	if(a[i] > group[j][0]){
	  group[j][0] = a[i];
	}
	if(b[i] < group[j][1]){
	  group[j][1] = b[i];
	}
	new_group_flag = 0;
      }
      else{ //other group or new group
	new_group_flag = 1;
      }
    }
    if(new_group_flag){
      group_num++;
      group[group_num-1][0] = a[i];
      group[group_num-1][1] = b[i];
    }
  }

  printf("%d\n", group_num);

  return 0;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:10:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &N);
   ^
./Main.c:11:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &M);
   ^
./Main.c:14:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &a[i], &b[i]);
     ^

Judge Result