oj.uz

Submission #671055

# Submission time Handle Problem Language Result Execution time Memory
671055 2022-12-11T18:01:59 Z gavgav Fountain (eJOI20_fountain) C++17
100 / 100
 111 ms 9176 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vec vector
#define puB push_back
#define poB pop_back
#define qu queue

struct point{
    int energy, id; // id for at end print answers in right order
};
int main(){
    // input
    int nodesNumber, pointsNumber;
    scanf("%d%d", &nodesNumber, &pointsNumber);
    int weightsSum[nodesNumber + 1] {0};
    int radii[nodesNumber + 1] {1000000001};
    for (int i = 1; i <= nodesNumber; ++i)
        scanf("%d%d", &(radii[i]), &(weightsSum[i]));

    // create tree
    int output[pointsNumber];
    int path[nodesNumber + 1] {0};
    int top = 0;
    vec <vec <point> > points (nodesNumber + 1);
    for (int i = 0; i < pointsNumber; ++i){
        int position, energy;
        scanf("%d%d", &position, &energy);
        points[position].puB(point {energy, i});
    }
    for (int i = nodesNumber; i > 0; --i){
        while (radii[path[top]] <= radii[i]){
            --top;
        }
        ++top;
        path[top] = i;
        weightsSum[path[top]] += weightsSum[path[top - 1]];
        int left, middle, right, answer;
        for (int j = 0; j < points[i].size(); ++j){
            left = 0, right = top;
            while (left <= right){
                middle = (left + right) / 2;
                if (weightsSum[path[top]] - weightsSum[path[middle]] < points[i][j].energy){
                    right = middle - 1;
                    answer = middle;
                }
                else{
                    left = middle + 1;
                }
            }
            output[points[i][j].id] = path[answer];
        }
    }
    for (int i = 0; i < pointsNumber; ++i)
        printf("%d\n", output[i]);
}

Compilation message

fountain.cpp: In function 'int main()':
fountain.cpp:39:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |         for (int j = 0; j < points[i].size(); ++j){
      |                         ~~^~~~~~~~~~~~~~~~~~
fountain.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     scanf("%d%d", &nodesNumber, &pointsNumber);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         scanf("%d%d", &(radii[i]), &(weightsSum[i]));
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:28:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         scanf("%d%d", &position, &energy);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:51:50: warning: 'answer' may be used uninitialized in this function [-Wmaybe-uninitialized]
   51 |             output[points[i][j].id] = path[answer];
      |                                       ~~~~~~~~~~~^

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 76 ms 6648 KB Output is correct
2 Correct 83 ms 6948 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 76 ms 6648 KB Output is correct
9 Correct 83 ms 6948 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 53 ms 4728 KB Output is correct
12 Correct 111 ms 8620 KB Output is correct
13 Correct 111 ms 9040 KB Output is correct
14 Correct 92 ms 9172 KB Output is correct
15 Correct 100 ms 9176 KB Output is correct