제출 #1023385

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1023385		Shadxwed	Fountain (eJOI20_fountain)	C11	30 / 100	1532 ms	2200 KiB

fountain

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

// Function to compare two integers (for qsort)
int compare(const void *a, const void *b) {
    return (*(int *)a - *(int *)b);
}

int main() {
    int n, q;

    // Reading number of elements and queries
    scanf("%d %d", &n, &q);

    int *d = malloc(n * sizeof(int));
    int *v = malloc(n * sizeof(int));
    int *prefixSum = malloc((n + 1) * sizeof(int));
    int *indices = malloc(n * sizeof(int));

    // Reading values into arrays
    for (int i = 0; i < n; i++) {
        scanf("%d %d", &d[i], &v[i]);
        indices[i] = i;  // Initialize indices
    }

    // Compute prefix sums
    prefixSum[0] = 0;
    for (int i = 1; i <= n; i++) {
        prefixSum[i] = prefixSum[i - 1] + v[i - 1];
    }

    // Sort indices based on the values in d
    qsort(indices, n, sizeof(int), compare);

    int q1, q2;
    for (int i = 0; i < q; i++) {
        scanf("%d %d", &q1, &q2);
        q1--;

        int prev = -1;
        int remaining = q2;

        // Binary search to find the appropriate segment
        for (int j = q1; j < n; j++) {
            int idx = indices[j];
            if (d[idx] > prev) {
                remaining -= v[idx];
                prev = d[idx];
                if (remaining <= 0) {
                    printf("%d\n", idx + 1);
                    break;
                }
            }
        }

        if (remaining > 0) {
            printf("0\n");
        }
    }

    // Free allocated memory
    free(d);
    free(v);
    free(prefixSum);
    free(indices);

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

fountain.c: In function 'main':
fountain.c:13:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     scanf("%d %d", &n, &q);
      |     ^~~~~~~~~~~~~~~~~~~~~~
fountain.c:22:9: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         scanf("%d %d", &d[i], &v[i]);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
fountain.c:37:9: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         scanf("%d %d", &q1, &q2);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40