Task: | Forest density |
Sender: | joaquimballester |
Submission time: | 2024-09-23 16:48:24 +0300 |
Language: | C++ (C++11) |
Status: | READY |
Result: | ACCEPTED |
test | verdict | time | |
---|---|---|---|
#1 | ACCEPTED | 0.00 s | details |
#2 | ACCEPTED | 0.56 s | details |
#3 | ACCEPTED | 0.55 s | details |
Code
#include <bits/stdc++.h>using namespace std;vector<vector<int>> preprocess_forest(vector<vector<char> >& grid, int n){vector<vector<int> > prefix(n + 1, vector<int>(n + 1, 0));for (int i = 1; i <= n; ++i) {for (int j = 1; j <= n; ++j) {int value = 0;if(grid[i - 1][j - 1] == '*') value = 1;prefix[i][j] = value + prefix[i - 1][j]+ prefix[i][j - 1]- prefix[i - 1][j - 1];}}return prefix;}int count_trees_in_rectangle(vector<vector<int> >& prefix,int x1, int y1, int x2, int y2){return prefix[x2][y2] - prefix[x1 - 1][y2]- prefix[x2][y1 - 1] + prefix[x1 - 1][y1 - 1];}int main(){int n,q;cin >> n >>q;vector<vector<char> > grid(n,vector<char>(n));for(int i = 0; i < n; ++i){for(int j = 0; j < n; ++j)cin>>grid[i][j];}vector<vector<int> > prefix= preprocess_forest(grid, n);for (int i = 0; i < q; i++) {int x1,y1,x2,y2;cin >> x1 >> y1 >> x2 >> y2;cout << count_trees_in_rectangle(prefix, x1, y1, x2,y2) << endl;}}
Test details
Test 1
Verdict: ACCEPTED
input |
---|
10 100 **.*.*.**. *.**.*..*. .*****.**. **....***. ... |
correct output |
---|
10 14 5 7 8 ... |
user output |
---|
10 14 5 7 8 ... Truncated |
Test 2
Verdict: ACCEPTED
input |
---|
1000 200000 **.**.****..**.***..**.***.**.... |
correct output |
---|
41079 2824 15631 1548 8483 ... |
user output |
---|
41079 2824 15631 1548 8483 ... Truncated |
Test 3
Verdict: ACCEPTED
input |
---|
1000 200000 ******************************... |
correct output |
---|
1000000 1000000 1000000 1000000 1000000 ... |
user output |
---|
1000000 1000000 1000000 1000000 1000000 ... Truncated |