Submission #98874

#	Time	Username	Problem	Language	Result	Execution time	Memory
98874		bash	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	854 ms	153460 KiB

joi2019_ho_t1

/**
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*/
#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>

#define F first
#define S second
#define endl '\n'
#define deb(x) cout<<#x<<' '<<x<<endl;
#define pb push_back

const long long MAXN = 1e6 + 1;
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;


long long readInt() {
    bool minus1 = false;
    long long result = 0;
    char ch;
    ch = getchar();
    while (true) {
        if (ch == '-') break;
        if (ch >= '0' && ch <= '9') break;
        ch = getchar();
    }
    if (ch == '-') minus1 = true; else result = ch-'0';
    while (true) {
        ch = getchar();
        if (ch < '0' || ch > '9') break;
        result = result*10 + (ch - '0');
    }
    if (minus1)
        return -result;
    else
        return result;
}

#define int __int64_t

const int N = 3025;

char a[N][N];

int cntI[N][N];
int cntO[N][N];

main() {
	#ifdef IZI_KATKA
	assert(freopen("input", "r", stdin));
    assert(freopen("output", "w", stdout));
    #endif
    int n = readInt(), m = readInt();
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            cin >> a[i][j];
        }
    }
    for (int i = n; i >= 1; i--) {
        for (int j = 1; j <= m; j++) {
            cntI[i][j] = cntI[i + 1][j] + (a[i][j] == 'I');
        }
    }
    for (int i = 1; i <= n; i++) {
        for (int j = m; j >= 1; j--) {
            cntO[i][j] = cntO[i][j + 1] + (a[i][j] == 'O');
        }
    }
    int res = 0;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            if (a[i][j] == 'J') {
                int ans = cntI[i][j] * cntO[i][j];
                res += ans;
            }
        }
    }
    cout << res;
    return 0;
}

Compilation message (stderr)

joi2019_ho_t1.cpp:70:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50