Submission #631620

#	Time	Username	Problem	Language	Result	Execution time	Memory
631620		Justin1	Automobil (COCI17_automobil)	C++14	100 / 100	123 ms	31644 KiB

automobil

#include <bits/stdc++.h>
#define int __int128
using namespace std;
 
long long n,m,k,x,y,z;
int c[1000005], r[1000005];
char ch;
vector<int> colupd;
 
int mod(int x) {
	const int modval = 1e9+7;
	return ((x % modval) + modval) % modval;
}
 
signed main() {
	cin.tie(0), cout.tie(0) -> sync_with_stdio(0);
	cin >> n >> m >> k;
	for (int i = 1; i <= n; i++) r[i] = 1;
	for (int i = 1; i <= m; i++) c[i] = 1;
	for (int i = 1; i <= k; i++) {
		cin >> ch >> x >> y;
		if (ch == 'R') r[x] = mod(r[x] * y);
		else c[x] = mod(c[x] * y);
	}
	int ans;
	if (n*m & 1) ans = mod(mod((1 + n*m)/2) * mod(n*m));
	else ans = mod(mod(1 + n*m) * mod((n*m)/2));
	for (int i = 1; i <= m; i++) {
		if (c[i] != 1) colupd.push_back(i);
		ans += mod(mod(n*(2*i+(n-1)*m)/2) * mod(c[i]-1));
		ans = mod(ans);
	}
	for (int i = 1; i <= n; i++) {
		int st = m*(i-1)+1;
		ans += mod(mod(m*(2*st+m-1)/2) * mod(r[i]-1));
		if (r[i] != 1) {
			for (auto j : colupd) {
				int val = mod(m*(i-1) + j);
				ans -= mod(val * mod(r[i] + c[j] - 2));
				ans += mod(val * mod(r[i] * c[j] - 1));
			}
		}
		ans = mod(ans);
	}
	cout << (long long) ans << "\n";
}

• Subtask 1: 100 / 100