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Submission #1023385

# Submission time Handle Problem Language Result Execution time Memory
1023385 2024-07-14T17:31:46 Z Shadxwed Fountain (eJOI20_fountain) C
30 / 100
 1500 ms 2200 KB 
#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;
}

Compilation message

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
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 3 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1532 ms 2200 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 3 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Execution timed out 1532 ms 2200 KB Time limit exceeded
9 Halted 0 ms 0 KB -