Submission #1083156

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083156		vladilius	Teams (IOI15_teams)	C++17	0 / 100	4041 ms	20676 KiB

teams

#include <bits/stdc++.h>
#include "teams.h"
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second
#define ins insert

int n;
vector<int> a, b;
vector<pii> st;
 
void init(int N, int A[], int B[]){
    n = N;
    a.resize(n + 1);
    for (int i = 1; i <= n; i++) a[i] = A[i - 1];
    b.resize(n + 1);
    for (int i = 1; i <= n; i++) b[i] = B[i - 1];
    
    for (int i = 1; i <= n; i++) st.pb({a[i], b[i]});
    sort(st.begin(), st.end());
}

int pr(int x, int y){
    int out = 0;
    for (auto [u, v]: st){
        out += (u <= x && v <= y);
    }
    return out;
}

int sum(int x1, int y1, int x2, int y2){
    return pr(x2, y2) + pr(x1, y1) - pr(x1 - 1, y2) - pr(x2, y1 - 1);
}
 
int can(int m, int K[]){
    vector<int> k(m + 1);
    for (int i = 1; i <= m; i++) k[i] = K[i - 1];
    sort(k.begin() + 1, k.end());
    
    vector<pii> st;
    vector<int> pr = {0};
    
    auto get = [&](int x, int y){
        if (st.empty()) return sum(0, x, x, y);
        int l = 0, r = (int) st.size() - 1;
        while (l + 1 < r){
            int m = (l + r) / 2;
            if (st[m].ss >= y){
                l = m;
            }
            else {
                r = m - 1;
            }
        }
        if (st[r].ss >= y) l = r;
        if (st[l].ss < y) l = -1;
        
        int out = sum(0, x, x, y);
        
        if (l != -1) out -= sum(0, x, st[l].ff, y);
        if (l < pr.size()) out -= (pr.back() - pr[l]);
        
        return out;
    };
    
    auto add = [&](int x, int y){
        while (!st.empty() && st.back().ss <= y){
            st.pop_back();
            pr.pop_back();
        }
        
        if (st.empty()) pr.pb(sum(0, x, x, y));
        else pr.pb(pr.back() + sum(0, st.back().ff, x, y));
        
        st.pb({x, y});
    };
    
    for (int i = 1; i <= m; i++){
        while (!st.empty() && st.back().ss <= k[i]) st.pop_back();
        
        if (get(k[i], n) < k[i]) return 0;
        int l = k[i], r = n;
        while (l + 1 < r){
            int m = (l + r) / 2;
            if (get(k[i], m) < k[i]){
                l = m + 1;
            }
            else {
                r = m;
            }
        }
        if (get(k[i], l) >= k[i]) r = l;
        
        add(k[i], r);
    }
    return 1;
}

Compilation message (stderr)

teams.cpp: In function 'int can(int, int*)':
teams.cpp:43:17: warning: declaration of 'st' shadows a global declaration [-Wshadow]
   43 |     vector<pii> st;
      |                 ^~
teams.cpp:13:13: note: shadowed declaration is here
   13 | vector<pii> st;
      |             ^~
teams.cpp: In lambda function:
teams.cpp:50:17: warning: declaration of 'int m' shadows a parameter [-Wshadow]
   50 |             int m = (l + r) / 2;
      |                 ^
teams.cpp:38:13: note: shadowed declaration is here
   38 | int can(int m, int K[]){
      |         ~~~~^
teams.cpp:64:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |         if (l < pr.size()) out -= (pr.back() - pr[l]);
      |             ~~^~~~~~~~~~~
teams.cpp: In function 'int can(int, int*)':
teams.cpp:87:17: warning: declaration of 'int m' shadows a parameter [-Wshadow]
   87 |             int m = (l + r) / 2;
      |                 ^
teams.cpp:38:13: note: shadowed declaration is here
   38 | int can(int m, int K[]){
      |         ~~~~^

• Subtask 1: 0 / 21
• Subtask 2: 0 / 13
• Subtask 3: 0 / 43
• Subtask 4: 0 / 23