oj.uz

답안 #51840

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
51840 2018-06-21T15:49:05 Z win11905 Islands (IOI08_islands) C++11
87 / 100
 877 ms 52720 KB 
#include <bits/stdc++.h>
#define long long long 
#define pii pair<long, long>
#define x first
#define y second
using namespace std;

const int N = 1e6+5;

int n, deg[N];
long Answer, MaxAll[N];
pii par[N], MaxIn[N];

void solve(int p) {
    vector<pii> V;
    while(deg[p]) V.emplace_back(p, par[p].y), deg[p]--, p = par[p].x;
    int s = V.size();
    deque<pii> Q;
    long dis = V[0].y, pdis = 0, mx = 0;
    for(auto x : V) mx = max(mx, MaxAll[x.x]);
    for(int i = 1; i < s; ++i) {
        while(!Q.empty() && Q.back().x < dis + MaxIn[V[i].x].x) Q.pop_back();
        Q.push_back(pii(dis + MaxIn[V[i].x].x, i));
        dis += V[i].y;
    }
    mx = max(mx, MaxIn[V[0].x].x + Q.front().x);
    for(int i = 0; i < s-1; ++i) {
        if(Q.front().y == i+1) Q.pop_front();
        while(!Q.empty() && Q.back().x < dis + MaxIn[V[i].x].x) Q.pop_back();
        Q.push_back(pii(dis + MaxIn[V[i].x].x, i));
        dis += V[i].y, pdis += V[i].y;
        mx = max(mx, MaxIn[V[i+1].x].x + Q.front().x - pdis); 
    }
    Answer += mx;
}

int main() {
    scanf("%d", &n);
    for(int i = 1, a, b; i <= n; ++i) {
        scanf("%d %d", &a, &b);
        par[i] = pii(a, b);
        deg[a]++;
    }
    queue<int> Q;
    for(int i = 1; i <= n; ++i) if(!deg[i]) Q.emplace(i);
    while(!Q.empty()) {
        int now = Q.front(); Q.pop();
        MaxAll[now] = max(MaxAll[now], MaxIn[now].x + MaxIn[now].y);
        MaxAll[par[now].x] = max(MaxAll[par[now].x], MaxAll[now]);
        long ret = MaxIn[now].x + par[now].y;
        if(ret > MaxIn[par[now].x].x) swap(ret, MaxIn[par[now].x].x);
        if(ret > MaxIn[par[now].x].y) swap(ret, MaxIn[par[now].x].y);
        if(!--deg[par[now].x]) Q.emplace(par[now].x);
    }
    for(int i = 1; i <= n; ++i) if(deg[i]) solve(i);
    printf("%lld\n", Answer);
}

Compilation message

islands.cpp: In function 'int main()':
islands.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
islands.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 412 KB Output is correct
4 Correct 3 ms 412 KB Output is correct
5 Correct 3 ms 540 KB Output is correct
6 Correct 2 ms 540 KB Output is correct
7 Correct 3 ms 540 KB Output is correct
8 Correct 2 ms 540 KB Output is correct
9 Correct 3 ms 540 KB Output is correct
10 Incorrect 3 ms 648 KB Output isn't correct
11 Correct 2 ms 648 KB Output is correct

Subtask #2
3.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 648 KB Output is correct
2 Correct 3 ms 648 KB Output is correct

Subtask #3
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 680 KB Output is correct
2 Correct 4 ms 852 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 1256 KB Output is correct
2 Correct 18 ms 2540 KB Output is correct
3 Correct 10 ms 2540 KB Output is correct
4 Correct 7 ms 2540 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 20 ms 3416 KB Output is correct
2 Correct 36 ms 5028 KB Output is correct

Subtask #6
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 74 ms 10184 KB Output is correct
2 Correct 97 ms 10412 KB Output is correct
3 Correct 98 ms 15928 KB Output is correct

Subtask #7
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 148 ms 16624 KB Output is correct
2 Correct 168 ms 27216 KB Output is correct
3 Correct 214 ms 27216 KB Output is correct
4 Correct 234 ms 37228 KB Output is correct

Subtask #8
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 328 ms 37228 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 585 ms 43640 KB Output is correct
2 Correct 341 ms 43652 KB Output is correct
3 Correct 361 ms 43652 KB Output is correct
4 Correct 397 ms 43652 KB Output is correct
5 Correct 473 ms 52720 KB Output is correct
6 Correct 396 ms 52720 KB Output is correct
7 Correct 877 ms 52720 KB Output is correct