제출 #1228382

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1228382		Jer	Railway Trip 2 (JOI22_ho_t4)	C++20	8 / 100	30 ms	840 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 305;
int dist[MAXN][MAXN];
int n, k, m, q;

int main()
{
    scanf("%d%d%d", &n, &k, &m);
    int a, b;

    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            dist[i][j] = (i == j) ? 0 : INT_MAX;

    for (int i = 0; i < m; i++)
    {
        scanf("%d%d", &a, &b);
        a--, b--;
        if (a < b)
        {
            for (int s = a; s <= min(a + k - 1, b - 1); s++)
                for (int j = s + 1; j <= b; j++)
                    dist[s][j] = 1;
        }
        else
        {
            for (int s = a; s >= max(a - k + 1, b + 1); s--)
                for (int j = s - 1; j >= b; j--)
                    dist[s][j] = 1;
        }
    }

    for (int x = 0; x < n; x++)
        for (int i = 0; i < n; i++)
            for (int j = 0; j < n; j++)
                if (dist[i][x] != INT_MAX and dist[x][j] != INT_MAX and dist[i][x] + dist[x][j] < dist[i][j])
                    dist[i][j] = dist[i][x] + dist[x][j];

    scanf("%d", &q);

    while (q--)
    {
        int s, t;
        scanf("%d%d", &s, &t);
        s--, t--;
        printf("%d\n", (dist[s][t] == INT_MAX) ? -1 : dist[s][t]);
    }

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     scanf("%d%d%d", &n, &k, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:20:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         scanf("%d%d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:42:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
Main.cpp:47:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |         scanf("%d%d", &s, &t);
      |         ~~~~~^~~~~~~~~~~~~~~~

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