Submission #84339

#	Time	Username	Problem	Language	Result	Execution time	Memory
84339		win11905	Sails (IOI07_sails)	C++11	15 / 100	1083 ms	7940 KiB

sails

#include <bits/stdc++.h>
#define long long long
#define pii pair<int, int>
#define x first
#define y second
using namespace std;

const int N = 1e5+5;

int n, h[N], k[N];

int num[N];

int main() {
    scanf("%d", &n);
    for(int i = 1; i <= n; ++i) scanf("%d %d", h+i, k+i);
    for(int i = n; i > 0; --i) {
        vector<pii> now;
        for(int j = 1; j <= h[i]; ++j) now.emplace_back(num[j], j);
        sort(now.begin(), now.end(), [&](const pii &a, const pii &b) {
            if(a.x == b.x) return a.y > b.y;
            return a.x < b.x;
        });
        for(int j = 0; j < k[i]; ++j) num[now[j].y]++;
    }   
    long ans = 0;
    for(int i = 1; i < N; ++i) if(num[i]) ans += 1ll * num[i] * (num[i] - 1) / 2;
    printf("%lld\n", ans);
}

Compilation message (stderr)

sails.cpp: In function 'int main()':
sails.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
sails.cpp:16:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 1; i <= n; ++i) scanf("%d %d", h+i, k+i);
                                 ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 5
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10