제출 #1080348

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1080348		lovrot	동굴 (IOI13_cave)	C++17	컴파일 에러	0 ms	0 KiB

cave

#include <cstdio>
#include <algorithm>

using namespace std;

const int N = 1440;

int dwarf = 1, ans[N];
char c[10];

bool ask(int t) {
	int h = t / 60, m = t % 60;
	printf("at %d%d:%d%d check %d\n", h / 10, h % 10, m / 10, m % 10, dwarf);
	fflush(stdout);
	scanf(" %s ", c);
	return c[1] == 's';
} // 1 - sleep, 0 - wake

int main() {	
	int n; scanf("%d", &n);
	for(int &i = dwarf; i <= n; ++i) { 
		bool f = ask(0);
		
		int lo = 0, hi = N / 2; 
		for(int mi = (lo + hi) / 2; hi - lo > 1; mi = (lo + hi) / 2) { 
			bool res = ask(mi);	
			if(res == f) { 
				lo = mi;
			} else {
				hi = mi;
			}
		}

		ans[i] = !f ? lo + 1 : (lo + N / 2 + 1) % N;
	}

	printf("answer\n");
	for(int i = 0; i < n; ++i) { 
		int h = ans[i] / 60, m = ans[i] % 60;
		printf("%d%d:%d%d\n", h / 10, h % 10, m / 10, m % 10);
	}
	fflush(stdout);
	return 0;
}
		

컴파일 시 표준 에러 (stderr) 메시지

cave.cpp: In function 'bool ask(int)':
cave.cpp:15:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  scanf(" %s ", c);
      |  ~~~~~^~~~~~~~~~~
cave.cpp: In function 'int main()':
cave.cpp:20:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |  int n; scanf("%d", &n);
      |         ~~~~~^~~~~~~~~~
/usr/bin/ld: /tmp/cczQEoff.o: in function `main':
cave.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccqZJjqh.o:grader.c:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccqZJjqh.o: in function `main':
grader.c:(.text.startup+0x10): undefined reference to `exploreCave'
collect2: error: ld returned 1 exit status