Submission #84355

#	Time	Username	Problem	Language	Result	Execution time	Memory
84355		win11905	Sails (IOI07_sails)	C++11	30 / 100	1077 ms	3696 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];
vector<pii> V;

int num[N];

int main() {
    scanf("%d", &n);
    for(int i = 0, a, b; i < n; ++i) scanf("%d %d", &a, &b), V.emplace_back(a, b);
    sort(V.begin(), V.end());
    for(auto x : V) {
        int h, k; tie(h, k) = x;
        vector<pii> now;
        for(int j = 1; j <= h; ++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; ++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:16:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
sails.cpp:17:60: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 0, a, b; i < n; ++i) scanf("%d %d", &a, &b), V.emplace_back(a, b);
                                      ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 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