Submission #937489

#	Time	Username	Problem	Language	Result	Execution time	Memory
937489		Wansur	Soccer Stadium (IOI23_soccer)	C++17	0 / 100	1 ms	348 KiB

soccer

#include <bits/stdc++.h>
#define f first
#define s second
#define ent '\n'

#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")

typedef long long ll;
using namespace std;
struct seg{
    int m1,m2,sum,cnt;
};

const string out[2]={"NO\n","YES\n"};

const ll dx[]={0,1,0,-1,-1,1,1,-1};
const ll dy[]={1,0,-1,0,-1,1,-1,1};
const int mod=998244353;
const int md=1e9+7;
const int mx=2e3+12;
const bool T=0;

bool used[2001][2001];
int n;

void dfs(int x,int y){
    used[x][y]=1;
    for(int i=0;i<4;i++){
        int x1=dx[i]+x,y1=dy[i]+y;
        if(min(x1,y1)>=0 && max(x1,y1)<n && !used[x1][y1]){
            dfs(x1,y1);
        }
    }
}

int biggest_stadium(int N, vector<vector<int>> a){
    int sum=0;
    n=N;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            sum+=!a[i][j];
            if(a[i][j]){
                used[i][j]=1;
            }
        }
    }
    bool ok=0;
    int pos=0;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if(!used[i][j]){
                pos=i;
                if(ok)return 0;
                ok=1;
                dfs(i,j);
            }
        }
    }
    int l=-1,r=-1;
    bool sg=0;
    for(int i=pos;i<n;i++){
        int tl=-1,tr=-1;
        for(int j=0;j<n;j++){
            if(!a[i][j]) {
                ok = 1;
                if(tl==-1){
                    tl=j;
                }
                tr=j;
            }
        }
        if(tl==-1)break;
        if(l==-1){
            l=tl,r=tr;
        }
        if(!(l<=tl && tr<=r || tl<=l && r<=tr)){
            return 0;
        }
        if(tl<=l && r<=tr){
            if(sg)return 0;
        }
        else{
            sg=1;
        }
        l=tl,r=tr;
    }
    return sum;
}

Compilation message (stderr)

soccer.cpp: In function 'int biggest_stadium(int, std::vector<std::vector<int> >)':
soccer.cpp:77:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   77 |         if(!(l<=tl && tr<=r || tl<=l && r<=tr)){
      |              ~~~~~~^~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 6
• Subtask 2: 0 / 8
• Subtask 3: 0 / 22
• Subtask 4: 0 / 18
• Subtask 5: 0 / 16
• Subtask 6: 0 / 30