Submission #77441

#	Time	Username	Problem	Language	Result	Execution time	Memory
77441		Hassoony	Bob (COCI14_bob)	C++17	0 / 120	199 ms	8524 KiB

bob

#include <bits/stdc++.h>
#define F first
#define S second
using namespace std;
typedef long long ll;
typedef double D;
const ll mod=998244353;
const ll inf=(1ll<<61);
const int MX=1009;
int n,m,a[MX][MX],dp[MX][MX];
ll k[MX];
int DP(int x,int y){
    int &ret=dp[x][y];if(ret!=-1)return ret;
    if(x==0)return ret=1;
    if(a[x-1][y]==a[x][y])return ret=DP(x-1,y)+1;
    return ret=1;
}
ll ans=0;
void solve(int x,int b,int c){
    stack<int>s;
    for(int j=b;j<=c;j++){
        ll i=j;
        while(!s.empty()&&a[x][s.top()]>=a[x][j])i=s.top(),s.pop();
//        cout<<j<<" "<<i<<" "<<k[i]<<endl;
        if(i==j){
            ans+=dp[x][j]*(j-b+1);
            k[j]=dp[x][j]*(j-b+1);
            s.push(j);
            continue;
        }
        k[j]=dp[x][j]*(j-i) + k[i];
        ans+=k[j];
        s.push(j);
    }
    for(int j=b;j<=c;j++)k[j]=0;
    while(!s.empty())s.pop();
}
int main(){
    memset(dp,-1,sizeof(dp));
    cin>>n>>m;
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            scanf("%d",&a[i][j]);
        }
    }
    puts("");
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            DP(i,j);
        }
    }
//    puts("");
    for(int i=0;i<n;i++){
        int j=0,j1=0;
        while(j1<m){
            while(j1<m&&a[i][j1]==a[i][j])j1++;
            solve(i,j,j1-1);
            j=j1;
        }
    }
    cout<<ans<<endl;
}
/*
5 3
2 2 2
2 2 1
1 1 1
2 1 2
1 2 1
*/

Compilation message (stderr)

bob.cpp: In function 'int main()':
bob.cpp:43:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d",&a[i][j]);
             ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 12
• Subtask 3: 0 / 12
• Subtask 4: 0 / 12
• Subtask 5: 0 / 12
• Subtask 6: 0 / 12
• Subtask 7: 0 / 12
• Subtask 8: 0 / 12
• Subtask 9: 0 / 12
• Subtask 10: 0 / 12