Submission #102485

#	Time	Username	Problem	Language	Result	Execution time	Memory
102485		FutymyClone	Examination (JOI19_examination)	C++14	2 / 100	3107 ms	232768 KiB

examination

#include <bits/stdc++.h>

using namespace std;

const int N = 2e5 + 5;

int n, q, ans[N], cnt = 0;
map <int, int> bit[N], compress;
vector <int> vecm, veci;

struct data {
    int math, infor, sum;
    bool operator < (const data &rhs) const {
        return sum > rhs.sum;
    }
} a[N];

struct Query {
    int a, b, c, id;
    bool operator < (const Query &rhs) const {
        return c > rhs.c;
    }
} queries[N];

void update (int x, int y, int val) {
    for (int i = x; i > 0; i -= i & -i) {
        for (int j = y; j > 0; j -= j & -j) {
            bit[i][j] += val;
        }
    }
}

int get_value (int x, int y) {
    int ans = 0;
    for (int i = x; i < N; i += i & -i) {
        for (int j = y; j < N; j += j & -j) {
            ans += bit[i][j];
        }
    }

    return ans;
}

int main(){
    scanf("%d %d", &n, &q);
    for (int i = 1; i <= n; i++) {
        scanf("%d %d", &a[i].math, &a[i].infor);
        a[i].sum = a[i].math + a[i].infor;
        vecm.push_back(a[i].math);
        veci.push_back(a[i].infor);
    }

    for (int i = 1; i <= q; i++) {
        scanf("%d %d %d", &queries[i].a, &queries[i].b, &queries[i].c);
        queries[i].id = i;
        vecm.push_back(queries[i].a);
        veci.push_back(queries[i].b);
    }

    sort(a + 1, a + n + 1);
    sort(queries + 1, queries + q + 1);
    sort(vecm.begin(), vecm.end());
    sort(veci.begin(), veci.end());

    //Compress coordinate
    compress[vecm[0]] = ++cnt;
    for (int i = 1; i < vecm.size(); i++) if (vecm[i] > vecm[i - 1]) compress[vecm[i]] = ++cnt;
    for (int i = 1; i <= n; i++) a[i].math = compress[a[i].math];
    for (int i = 1; i <= q; i++) queries[i].a = compress[queries[i].a];

    cnt = 0; compress.clear();
    compress[veci[0]] = ++cnt;
    for (int i = 1; i < veci.size(); i++) if (veci[i] > veci[i - 1]) compress[veci[i]] = ++cnt;
    for (int i = 1; i <= n; i++) a[i].infor = compress[a[i].infor];
    for (int i = 1; i <= q; i++) queries[i].b = compress[queries[i].b];
    //

    int ptr = 1;
    for (int i = 1; i <= q; i++) {
        while (ptr <= n && a[ptr].sum >= queries[i].c) {
            update(a[ptr].math, a[ptr].infor, 1);
            ptr++;
        }

        ans[queries[i].id] = get_value(queries[i].a, queries[i].b);
    }

    for (int i = 1; i <= q; i++) printf("%d\n", ans[i]);
    return 0;
}

Compilation message (stderr)

examination.cpp: In function 'int main()':
examination.cpp:67:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 1; i < vecm.size(); i++) if (vecm[i] > vecm[i - 1]) compress[vecm[i]] = ++cnt;
                     ~~^~~~~~~~~~~~~
examination.cpp:73:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 1; i < veci.size(); i++) if (veci[i] > veci[i - 1]) compress[veci[i]] = ++cnt;
                     ~~^~~~~~~~~~~~~
examination.cpp:45:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &q);
     ~~~~~^~~~~~~~~~~~~~~~~
examination.cpp:47:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a[i].math, &a[i].infor);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
examination.cpp:54:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %d", &queries[i].a, &queries[i].b, &queries[i].c);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 0 / 20
• Subtask 3: 0 / 21
• Subtask 4: 0 / 57