Submission #1182192

#	Time	Username	Problem	Language	Result	Execution time	Memory
1182192		CodeLakVN	Strah (COCI18_strah)	C++20	110 / 110	102 ms	4512 KiB

strah

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

#define task "18_strah"
#define no "NO"
#define yes "YES"
#define F first
#define S second
#define vec vector
#define _mp make_pair
#define ii pair<int, int>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define evoid(val) return void(std::cout << val)
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)

const int MAX_N = (int)2e3 + 5;

int numRow, numCol;
string input[MAX_N];

int h[MAX_N], l[MAX_N], r[MAX_N];

void solve() {
    cin >> numRow >> numCol;
    FOR(i, 1, numRow) {
        cin >> input[i];
        input[i] = " " + input[i];
    }

    long long ans = 0;

    FOR(i, 1, numRow) {
        FOR(j, 1, numCol) h[j] = (input[i][j] == '.' ? h[j] + 1 : 0);

        stack<int> st;
        l[1] = 0;
        st.push(1);
        FOR(j, 2, numCol) {
            while (!st.empty() && h[st.top()] > h[j]) st.pop();
            l[j] = (st.empty() ? 0 : st.top()); 
            st.push(j);
        }
        while (!st.empty()) st.pop();
        r[numCol] = numCol + 1;
        st.push(numCol);
        FOD(j, numCol - 1, 1) {
            while (!st.empty() && h[st.top()] >= h[j]) st.pop();
            r[j] = (st.empty() ? numCol + 1 : st.top());
            st.push(j);
        }

        FOR(j, 1, numCol) {
            int L = j - l[j], R = r[j] - j;
            long long H = 1LL * h[j] * (h[j] + 1) / 2;
            long long sumL = 1LL * L * (L + 1) / 2;
            long long sumR = 1LL * R * (R - 1) / 2;

            // cout << j << ": " << L << ", " << R << "\n";

            ans += 1LL * H * (1LL * R * sumL + 1LL * L * sumR);
        }
    }

    cout << ans;
}

int32_t main() {
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    bool multitest = 0;
    int numTest = 1;
    if (multitest) cin >> numTest;

    while (numTest--) {
        solve();
    }

    return 0;
}

/* Lak lu theo dieu nhac!!!! */

Compilation message (stderr)

strah.cpp: In function 'int32_t main()':
strah.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(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
strah.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(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 11 / 11
• Subtask 5: 11 / 11
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 11 / 11
• Subtask 9: 11 / 11
• Subtask 10: 11 / 11