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F - Operations on a Matrix
https://atcoder.jp/contests/abc253/submissions/35160697
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AtCoder/ABC253/F/F.cpp
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AtCoder/ABC253/F/F.cpp
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#include <iostream>
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#include <tuple>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 2e5 + 5;
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int n, m, q, idx, cnt, lst[N];
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long long c[N], val[N], ans[N];
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std::vector<std::tuple<int, int, int>> changes;
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std::vector<std::tuple<int, int, bool>> queries[N];
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int lowbit(int x) {
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return x & -x;
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}
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void add(int x, int y) {
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for (; x <= m; x += lowbit(x)) c[x] += y;
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}
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long long sum(int x) {
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long long res = 0;
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for (; x; x -= lowbit(x)) res += c[x];
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return res;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> m >> q;
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changes.emplace_back(1, n, 0);
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for (int i = 1; i <= q; i++) {
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int op;
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cin >> op;
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switch (op) {
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case 1: {
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int l, r, x;
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cin >> l >> r >> x;
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changes.emplace_back(l, r, x);
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idx++;
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break;
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}
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case 2: {
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int i, x;
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cin >> i >> x;
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lst[i] = idx;
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val[i] = x;
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break;
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}
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case 3: {
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int i, j;
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cin >> i >> j;
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ans[++cnt] = val[i];
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queries[lst[i]].emplace_back(j, cnt, false);
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queries[idx].emplace_back(j, cnt, true);
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break;
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}
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}
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}
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for (int i = 0; i < changes.size(); i++) {
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int l, r, x;
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std::tie(l, r, x) = changes[i];
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add(l, x);
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add(r + 1, -x);
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for (auto query : queries[i]) {
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int pos, id, type;
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std::tie(pos, id, type) = query;
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if (type) ans[id] += sum(pos);
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else ans[id] -= sum(pos);
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}
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}
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for (int i = 1; i <= cnt; i++) {
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cout << ans[i] << endl;
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}
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return 0;
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}
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