Submission #233552

#	Time	Username	Problem	Language	Result	Execution time	Memory
233552		alishahali1382	Strah (COCI18_strah)	C++14	77 / 110	171 ms	16208 KiB

strah

#include <bits/stdc++.h>
#pragma GCC optimize ("O2")
#pragma GCC optimize ("unroll-loops")
//#pragma GCC optimize("no-stack-protector,fast-math")

using namespace std;
typedef unsigned long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<pii, int> piii;
typedef pair<ll, ll> pll;
#define debug(x) cerr<<#x<<'='<<(x)<<endl;
#define debugp(x) cerr<<#x<<"= {"<<(x.first)<<", "<<(x.second)<<"}"<<endl;
#define debug2(x, y) cerr<<"{"<<#x<<", "<<#y<<"} = {"<<(x)<<", "<<(y)<<"}"<<endl;
#define debugv(v) {cerr<<#v<<" : ";for (auto x:v) cerr<<x<<' ';cerr<<endl;}
#define all(x) x.begin(), x.end()
#define pb push_back
#define kill(x) return cout<<x<<'\n', 0;

const ld eps=1e-7;
const int inf=1000000010;
const ll INF=10000000000000010LL;
const int mod=1000000007;
const int N=2010;

ll n, m, k, u, v, x, y, t, a, b, ans;
int A[N][N];
ll L[N], R[N];
ll sum[N];

ll C2(ll x){
	return x*(x+1)/2;
}

int main(){
	ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	cin>>n>>m;
	for (int i=1; i<=n; i++) for (int j=1; j<=m; j++){
		char ch;
		cin>>ch;
		if (ch=='.') A[i][j]=(A[i-1][j]+1);
	}
	for (int i=1; i<=n; i++) for (int j=1; j<=i; j++) sum[i]+=j*(i-j+1ll);
	for (int i=1; i<=n; i++){
		for (int j=1; j<=m; j++) for (L[j]=j-1; L[j] && A[i][L[j]]>=A[i][j]; L[j]=L[L[j]]);
		for (int j=m; j; j--) for (R[j]=j+1; R[j]<=m && A[i][R[j]]>A[i][j]; R[j]=R[R[j]]);
		for (int j=1; j<=m; j++) ans+=1ll*C2(A[i][j])*(sum[R[j]-L[j]-1]-sum[R[j]-j-1]-sum[j-L[j]-1]);
	}
	cout<<ans<<'\n';
	
	return 0;
}
/*
2 3
.#.
..#

*/

Compilation message (stderr)

strah.cpp: In function 'int main()':
strah.cpp:40:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=1; i<=n; i++) for (int j=1; j<=m; j++){
                ~^~~
strah.cpp:40:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=1; i<=n; i++) for (int j=1; j<=m; j++){
                                         ~^~~
strah.cpp:45:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=1; i<=n; i++) for (int j=1; j<=i; j++) sum[i]+=j*(i-j+1ll);
                ~^~~
strah.cpp:46:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=1; i<=n; i++){
                ~^~~
strah.cpp:47:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int j=1; j<=m; j++) for (L[j]=j-1; L[j] && A[i][L[j]]>=A[i][j]; L[j]=L[L[j]]);
                 ~^~~
strah.cpp:49:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int j=1; j<=m; j++) ans+=1ll*C2(A[i][j])*(sum[R[j]-L[j]-1]-sum[R[j]-j-1]-sum[j-L[j]-1]);
                 ~^~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 11
• Subtask 3: 11 / 11
• Subtask 4: 11 / 11
• Subtask 5: 11 / 11
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 0 / 11
• Subtask 9: 11 / 11
• Subtask 10: 11 / 11