Submission #382831

#	Time	Username	Problem	Language	Result	Execution time	Memory
382831		aris12345678	Fountain (eJOI20_fountain)	C++14	30 / 100	95 ms	5356 KiB

fountain

#include <bits/stdc++.h>
using namespace std;

const int mxN = 1e6+5;
int diam[mxN], cap[mxN], pref[mxN];

int main() {
    int n, q;
    scanf("%d%d", &n, &q);
    for(int i = 1; i <= n; i++) {
        scanf("%d%d", &diam[i], &cap[i]);
        pref[i] = cap[i]+pref[i-1];
    }
    if(is_sorted(diam+1, diam+n+1)) {
        while(q--) {
            int r, v;
            scanf("%d%d", &r, &v);
            int st = 1, en = n, ans, md;
            while(st <= en) {
                md = (st+en)/2;
                if(pref[md]-pref[r-1] < v)
                    st = md+1;
                else
                    ans = md, en = md-1;
            }
            if(pref[n]-pref[r-1] < v)
                printf("0\n");
            else
                printf("%d\n", ans);
        }
    } else {
        while(q--) {
            int r, v;
            scanf("%d%d", &r, &v);
            int ans = 0, sum = cap[r], prev = r;
            for(int i = r+1; i <= n; i++) {
                if(diam[i] > diam[prev])
                    sum += cap[i], prev = i;
                if(sum >= v) {
                    ans = prev;
                    break;
                }
            }
            if(sum >= v && r+1 > n)
                ans = r;
            printf("%d\n", ans);
        }
    }
    return 0;
}

Compilation message (stderr)

fountain.cpp: In function 'int main()':
fountain.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |     scanf("%d%d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~
fountain.cpp:11:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |         scanf("%d%d", &diam[i], &cap[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:17:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |             scanf("%d%d", &r, &v);
      |             ~~~~~^~~~~~~~~~~~~~~~
fountain.cpp:34:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   34 |             scanf("%d%d", &r, &v);
      |             ~~~~~^~~~~~~~~~~~~~~~

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