Submission #1184308

#	Time	Username	Problem	Language	Result	Execution time	Memory
1184308		InvMOD	Bob (COCI14_bob)	C++17	120 / 120	63 ms	4400 KiB

bob

#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define gcd __gcd
#define sz(v) (int) v.size()
#define pb push_back
#define pi pair<int,int>
#define all(v) (v).begin(), (v).end()
#define compact(v) (v).erase(unique(all(v)), (v).end())
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define ROF(i, a, b) for(int i = (a); i >= (b); i--)
#define dbg(x) "[" #x " = " << (x) << "]"
///#define int long long

using ll = long long;
using ld = long double;
using ull = unsigned long long;

template<typename T> bool ckmx(T& a, const T& b){if(a < b) return a = b, true; return false;}
template<typename T> bool ckmn(T& a, const T& b){if(a > b) return a = b, true; return false;}

const int N = 2e5+5;
const ll MOD = 1e9+7;
const ll INF = 1e18;




void solve()
{
    int n,m; cin >> n >> m;

    vector<vector<int>> a(n + 1, vector<int>(m + 1));
    FOR(i, 1, n) FOR(j, 1, m) cin >> a[i][j];

    vector<int> dp(m + 1, 1); vector<ll> pref(m + 1, 0);
    ll answer = 0;
    FOR(i, 1, n){
        //FOR(j, 1, m) cout << dp[j] << " \n"[j == m];

        stack<int> st; st.push(0);
        FOR(j, 1, m){
            while(a[i][j] == a[i][st.top()] && dp[j] < dp[st.top()]){
                st.pop();
            }

            pref[j] = 1ll * dp[j] * (j - st.top());
            if(a[i][j] == a[i][st.top()])
                pref[j] += pref[st.top()];
            answer += pref[j];

            st.push(j);
        }

        FOR(j, 1, m) pref[j] = 0, (i < n && a[i + 1][j] == a[i][j] ? dp[j] = dp[j] + 1 : dp[j] = 1);
    }

    cout << answer << "\n";
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP","r",stdin);
        freopen(name".OUT","w",stdout);
    }

    int t = 1; //cin >> t;
    while(t--) solve();
    return 0;
}

Compilation message (stderr)

bob.cpp: In function 'int main()':
bob.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen(name".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
bob.cpp:72:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         freopen(name".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• 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