Submission #1306797

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Source Code Expand

#include <math.h>
#include <stdlib.h>
#include <stdio.h>

int main(void){

  int N;
  int R[1000];
  int S = 0;

  // 入力
  scanf("%d",&N);

  for(int i=0;i<N;i++) {
    scanf("%d",&R[i]);
    //printf("%d\n", R[i]);
  }

  int tmp;

  // ソートを実行
  for(int i=0;i<N-1;i++){
    for(int j=N-1;i<j;j--){
      if(R[j-1] > R[j]){
        tmp = R[j];
        R[j] = R[j-1];
        R[j-1] = tmp;
      }
    }
  }

  /* デバッグ
  for(int i=0;i<N;i++) {
    printf("%d\n", R[i]);
  } */

  //for(int i=0+2;i<N;i+=2){
  for(int i=0;i<N;i++){
    S += pow((double)R[i], 2.0) * ( i%2==0 ? 1 : -1);
    //printf("%d\n", R[i]);
  }

  // 結果の出力
  printf("%.12f\n",(double)S * M_PI);
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:12:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&N);
   ^
./Main.c:15:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&R[i]);
     ^

Judge Result