Submission #238388

#	Time	Username	Problem	Language	Result	Execution time	Memory
238388		ant101	Bob (COCI14_bob)	C++14	120 / 120	193 ms	25860 KiB

bob

#include <iostream>
#include <algorithm>
#include <cstring>
#include <iomanip>
#include <fstream>
#include <cmath>
#include <vector>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <map>
#include <stack>
#include <queue>
#include <assert.h>
#include <limits>
#include <cstdio>
using namespace std;

//#define RDEBUG 1
#ifdef RDEBUG
#define D(x) x
#else
#define D(x)
#endif
#define inf 0x7fffffff
#define MOD 1000000007

typedef long long ll;


ll add(ll a, ll b) {
    a += b;
    if(a >= MOD) {
        a -= MOD;
    }
    return a;
}
ll sub(ll a, ll b) {
    a -= b;
    if(a < 0) {
        a += MOD;
    }
    return a;
}

ll mul(ll a, ll b) {
    return (a * b)%MOD;
}

void add_self(ll& a, ll b) {
    a = add(a, b);
}
void sub_self(ll& a, ll b) {
    a = sub(a, b);
}
void mul_self(ll& a, ll b) {
    a = mul(a, b);
}


const ll MAXN = 200010;


int main() {
    int n , m ;
    scanf("%d %d" , &n , &m) ;
    int arr[n+2][m+2] , now[n+2][m+2];
    for(int i = 1 ; i <= n ; ++i) {
        for(int j = 1 ; j <= m ; ++j)
            scanf("%d" , &arr[i][j]) ;
    }
    //prepare now for every element
    for(int i = 1 ; i <= n ; ++i) {
        now[i][m] = 1ll ;
        for(int j = m-1 ; j >= 1 ; --j) {
            if(arr[i][j] == arr[i][j+1])
                now[i][j] = now[i][j+1] + 1ll;
            else
                now[i][j] = 1ll;
        }
    }
    long long ans = 0ll ;
    long long sol[n+2][m+2] ;
    //loop on every column
    for(int j = 1 ; j <= m ; ++j) {
        arr[0][j] = -1 ;
        stack< pair<int , int> >s ;
        for(int i = 1 ; i <= n ; ++i) {
            pair<int , int>cur ;
            cur.first = i , cur.second = 1ll ;
            sol[i][j] = 0ll ;
            //new value
            if(arr[i][j] != arr[i-1][j]) {
                while(!s.empty())
                    s.pop() ;
                sol[i][j] = now[i][j] * 1ll;
                ans += sol[i][j] ;
                s.push(cur) ;
                continue ;
            }
            //loop in stack
            while (!s.empty() && now[s.top().first][j] >= now[i][j]) {
                pair<int , int>p = s.top() ;
                s.pop();
                cur.second += p.second ;
            }
            sol[i][j] = (cur.second * 1ll * now[i][j]) ;
            if (s.size() > 0) {
                pair<int , int>p = s.top() ;
                sol[i][j] += sol[p.first][j] ;
            }
            ans += sol[i][j] ;
            s.push(cur) ;
        }
    }
    return printf("%lld" , ans) , 0 ;
}

Compilation message (stderr)

bob.cpp: In function 'int main()':
bob.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d" , &n , &m) ;
     ~~~~~^~~~~~~~~~~~~~~~~~~
bob.cpp:70:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d" , &arr[i][j]) ;
             ~~~~~^~~~~~~~~~~~~~~~~~~

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