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48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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inline int lowbit(int x) { return x & -x; }
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const int N = 2e5 + 50;
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set<unsigned> C[N];
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int OP[N], X[N], Y[N], H[N];
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void add(unsigned x, unsigned y)
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{
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for (; x < N; x += lowbit(x))
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C[x].insert(y);
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}
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unsigned query(unsigned x, unsigned y)
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{
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unsigned ans = -1;
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for (; x; x -= lowbit(x))
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{
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auto ite = C[x].lower_bound(y);
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if (ite != C[x].end())
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ans = min(ans, *ite);
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}
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return ans;
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}
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int main()
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{
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int N, Q;
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char op[3];
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scanf("%d%d", &N, &Q);
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for (int i = 0; i < Q; i++)
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{
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scanf("%s%d%d", op, X + i, Y + i);
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OP[i] = (*op == 'D');
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}
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memcpy(H, X, sizeof(X));
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sort(H, H + Q);
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auto len = unique(H, H + Q) - H;
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for (int i = 0; i < Q; i++) X[i] = lower_bound(H, H + len, X[i]) - H + 1;
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for (int i = 0; i < Q; i++)
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{
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if (OP[i] == 0)
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add(X[i], Y[i]);
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if (OP[i] == 1)
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printf("%d\n", query(X[i], Y[i]));
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}
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return 0;
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}
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