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2020 China Collegiate Programming Contest, Weihai Site H题(差分)

题目链接

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#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cmath>
#include <vector>
#include <map>
#include <set>
using namespace std;
typedef long long ll;

const int N = 201000;

int n, m, s;
int cnt[N];
int ans[N];

int main() {
cin >> n >> m >> s;
int tt = 0;
set<int> group[N];
while(s--) {
int op, x, y;
scanf("%d%d%d", &op, &x, &y);
if(op == 1) {
group[y].insert(x);
ans[x] -= cnt[y];
} else if(op == 2) {
group[y].erase(x);
ans[x] += cnt[y];
} else if(op == 3) {
cnt[y]++;
ans[x]--;
}
}
for(int i = 1; i <= n; i++) {
for(auto it:group[i]) ans[it] += cnt[i];
}
for(int i = 1; i <= m; i++) {
printf("%d\n", ans[i]);
}

return 0;
}
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