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Submission #53728

# Submission time Handle Problem Language Result Execution time Memory
53728 2018-07-01T06:02:58 Z 강한남자킹현수(#2036) Islands (IOI08_islands) C++11
16 / 100
 555 ms 136528 KB 
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
#define X first
#define Y second

const int N = 1000005;
const ll INF = ll(1e18);

vector<pil> e[N];

int n, v[N], o[N], c, p[N], q[N];
vector<int> w;
vector<ll> d;
ll a[2 * N], b[2 * N], r, u[N];

void f(int x, int y){
    if(q[x]){
        p[c] = -1;
        for(int i = c - 1; p[i + 1] != x; i--){
            w.push_back(p[i]);
            d.push_back(u[i]);
            o[p[i]] = 1;
        }
        return;
    }
    if(v[x]) return;
    v[x] = 1;
    int r = 0;
    for(pil i : e[x]){
        if(i.X == y) continue;
        q[x] = 1;
        p[c] = x;
        u[c] = i.Y;
        c++;
        f(i.X, x);
        q[x] = 0;
        c--;
    }
}

ll g(int x, int p){
    ll r = 0;
    for(pil i : e[x]){
        if(o[i.X] || i.X == p) continue;
        r = max(r, g(i.X, x) + i.Y);
    }
    return r;
}

int main(){
    scanf("%d", &n);
    for(int i = 1; i <= n; i++){
        int x; ll y;
        scanf("%d%lld", &x, &y);
        e[i].push_back({x, y});
        e[x].push_back({i, y});
    }
    for(int i = 1; i <= n; i++){
        if(v[i]) continue;
        w.clear();
        d.clear();
        f(i, 0);
        int s = w.size();
        //for(int j = 0; j < s; j++) printf("aa %d %lld\n", w[j], d[j]);
        for(int j = 0; j < s; j++){
            a[j] = a[j + s] = g(w[j], 0);
            b[j] = d[j] + (j ? b[j - 1] : 0);
        }
        //for(int j = 0; j < s; j++) printf("bb %lld %lld\n", a[j], b[j]);
        for(int j = 0; j < s; j++) b[j + s] = b[j + s - 1] + d[j];
        ll t = 0;
        priority_queue<pli> lq, rq;
        for(int j = 1; j < s; j++) rq.push({a[j] + b[j], j});
        for(int j = 0, k = 0; j < s; j++){
            while(!lq.empty() && lq.top().Y <= j) lq.pop();
            while(k < j + s && b[k] - b[j] < b[j + s] - b[k]) k++;
            while(!rq.empty() && rq.top().Y < k){
                int x = rq.top().Y;
                lq.push({a[x] - b[x], x});
                rq.pop();
            }
            t = max(t, max((lq.empty() ? -INF : lq.top().X) + b[j + s],
                           (rq.empty() ? -INF : rq.top().X) - b[j]) + a[j]);
            rq.push({a[j + s] + b[j + s], j + s});
        }
        r += t;
    }
    printf("%lld\n", r);
}

Compilation message

islands.cpp: In function 'void f(int, int)':
islands.cpp:32:9: warning: unused variable 'r' [-Wunused-variable]
     int r = 0;
         ^
islands.cpp: In function 'int main()':
islands.cpp:55:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
islands.cpp:58:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%lld", &x, &y);
         ~~~~~^~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 23800 KB Output isn't correct
2 Incorrect 24 ms 24168 KB Output isn't correct
3 Correct 24 ms 24168 KB Output is correct
4 Incorrect 23 ms 24168 KB Output isn't correct
5 Correct 23 ms 24168 KB Output is correct
6 Incorrect 27 ms 24168 KB Output isn't correct
7 Incorrect 24 ms 24168 KB Output isn't correct
8 Incorrect 25 ms 24168 KB Output isn't correct
9 Incorrect 28 ms 24168 KB Output isn't correct
10 Incorrect 24 ms 24168 KB Output isn't correct
11 Incorrect 26 ms 24172 KB Output isn't correct

Subtask #2
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 24188 KB Output is correct
2 Incorrect 25 ms 24192 KB Output isn't correct

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 27 ms 24192 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 25472 KB Output is correct
2 Correct 53 ms 28676 KB Output is correct
3 Incorrect 41 ms 28676 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 30708 KB Output is correct
2 Correct 83 ms 33664 KB Output is correct

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 181 ms 39816 KB Output is correct
2 Incorrect 307 ms 50080 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 296 ms 51652 KB Output is correct
2 Correct 369 ms 84824 KB Output is correct
3 Incorrect 519 ms 105504 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 433 ms 105504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 555 ms 136528 KB Output isn't correct
2 Halted 0 ms 0 KB -