Submission #616154

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Source Code Expand

// scanf 等でエラーを出さないように追加
#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <set>


int main() {

	int N = 0;
	scanf("%d\n", &N);
	
	if (N < 25) {
		printf("0\n");
		return 0;
	}

	int num = 0;

	for (int i = 5; i <= N; i += 10) {
		int digit = strlen(std::to_string(i).c_str());
		int dec_digit = (int)pow(10, digit-1);

		if (i / dec_digit == 2) {
			num++;
		}
	}

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


	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:19:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d\n", &N);
                   ^

Judge Result