제출 #468636

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
468636		gavgav	Fountain (eJOI20_fountain)	C++17	0 / 100	106 ms	3072 KiB

fountain

#include <iostream>
#include <vector>
#include <stack>
using namespace std;
int main(){
    /*
     * Get dates about fountain.
     * Creating array in witch every number denotes index of the nearest number witch greater than this reservoir.
     * Indexes in this array means number of reservoir.
     */
    int height, queries, ways_number = 0;
    scanf("%d%d", &height, &queries);
    int diameters[height], next_grater[height + 1], capacities[height + 1];
    capacities[height] = 0;
    next_grater[height] = -1;
    vector <int> starts;
    stack <int> meowmeow;
    for (int i = 0; i < height; i++){
        scanf("%d%d", &diameters[i], &capacities[i]);
        if (!meowmeow.empty() && diameters[i] > diameters[meowmeow.top()]){
            do{
                next_grater[meowmeow.top()] = i;
                meowmeow.pop();
            }while (!meowmeow.empty() && diameters[i] > diameters[meowmeow.top()]);
        }
        else{
            ways_number++;
            starts.push_back(i);
        }
        meowmeow.push(i);
    }
    while (!meowmeow.empty()){
        next_grater[meowmeow.top()] = height;
        meowmeow.pop();
    }
    /*
     * Creating of any possible water path.
     */

    int indexes[height];
    vector <int> lengths (ways_number, -1);
    vector <vector <int>> ways  (ways_number);
    for (int i = 0; i < ways_number; i++){
        for (int j = starts[i]; j != -1; j = next_grater[j]) {
            ways[i].push_back(j);
            lengths[i]++;
            indexes[j] = i;
        }
    }
    /*
     * Creating postfix sums array.
     */
    for (int i = height - 1; i > -1; i--){
        if (next_grater[i] != -1){
            capacities[i] += capacities[next_grater[i]];
        }
    }
    /*
     * Get queries and by binary search print answer.
     */
    int volume, level, left, right, middle, answer;
    while (queries--){
        scanf("%d%d", &level, &volume);
        level--;
        left = 0, right = lengths[indexes[level]];
        while (left - right < 1){
            middle = (left + right) / 2;
            if (volume > capacities[level] - capacities[ways[indexes[level]][middle]]){
                answer = ways[indexes[level]][middle] + 1;
                left = middle + 1;
            }
            else {
                right = middle - 1;
            }
        }
        printf("%d\n", answer % (height + 1));
    }
}

컴파일 시 표준 에러 (stderr) 메시지

fountain.cpp: In function 'int main()':
fountain.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     scanf("%d%d", &height, &queries);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
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", &diameters[i], &capacities[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:63:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         scanf("%d%d", &level, &volume);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:76:15: warning: 'answer' may be used uninitialized in this function [-Wmaybe-uninitialized]
   76 |         printf("%d\n", answer % (height + 1));
      |         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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