Submission #485906

#	Time	Username	Problem	Language	Result	Execution time	Memory
485906		gavgav	Fountain (eJOI20_fountain)	C++17	100 / 100	94 ms	8084 KiB

fountain

#include <iostream>
#define MAX_N 100000
#define MAX_M 200000
#define MAX_S 100000000000000
using namespace std;
struct reservoir {
    long long diameters, capacity;
};
struct query {
    int level, volume, rasp;
};
int main() {
    int next[MAX_M + 1], liste[MAX_N + 1];
    long long sumaNec[MAX_N + 1];
    fill(next, next + MAX_M + 1, 0);
    long long height, queries_number, top, i, j;
    long long sumaV;
    scanf( "%lld%lld", &height, &queries_number);
    long long stack[height + 1];
    struct reservoir reservoirs[height + 1];
    struct query queries[queries_number + 1];
    reservoirs[0].diameters = 1000000001;
    reservoirs[0].capacity = 0;
    for (i = 1; i <= height; ++i)
        scanf( "%lld%lld", &reservoirs[i].diameters, &reservoirs[i].capacity);
    for (i = 1; i <= queries_number; ++i) {
        scanf( "%d%d", &queries[i].level, &queries[i].volume);
        next[i] = liste[queries[i].level];
        liste[queries[i].level] = i;
    }
    stack[0] = 0;
    sumaNec[0] = -MAX_S - 1;
    top = 0;
    sumaV = 0;
    long long left, middle, right;
    for (i = height; i >= 1; --i) {
        while ( reservoirs[i].diameters >= reservoirs[stack[top]].diameters ) {
            sumaV -= reservoirs[stack[top]].capacity;
            --top;
        }
        ++top;
        stack[top] = i;
        sumaNec[top] = sumaV;
        sumaV += reservoirs[i].capacity;
        j = liste[i];
        while (j != 0) {
            right = top + 1;
            left = 0;
            while (right - left > 1 ) {
                middle = (right + left) / 2;
                if (sumaV - sumaNec[middle] >= queries[j].volume)
                    left = middle;
                else
                    right = middle;
            }
            queries[j].rasp = stack[left];
            j = next[j];
        }
    }
    for (i = 1; i <= queries_number; ++i)
        printf("%d\n", queries[i].rasp);
}

Compilation message (stderr)

fountain.cpp: In function 'int main()':
fountain.cpp:18:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     scanf( "%lld%lld", &height, &queries_number);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:25:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |         scanf( "%lld%lld", &reservoirs[i].diameters, &reservoirs[i].capacity);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:27:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |         scanf( "%d%d", &queries[i].level, &queries[i].volume);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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