Submission #484037

#	Time	Username	Problem	Language	Result	Execution time	Memory
484037		Cross_Ratio	Sorting (IOI15_sorting)	C++14	0 / 100	1 ms	460 KiB

sorting

#include <bits/stdc++.h>
#include "sorting.h"
using namespace std;
typedef pair<long long int, int> P;
vector<P> So;
vector<long long int> S;
vector<int> X, Y;
int N;
int findSwapPairs(int N2, int S2[], int M, int X2[], int Y2[], int P1[], int P2[]) {
    N = N2;
    int i, j;
    for(i=0;i<N;i++) {
        So.push_back(P(S2[i],i));
        S.push_back(S2[i]);
        X.push_back(X2[i]);
        Y.push_back(Y2[i]);
    }
    for(i=0;i<N;i++) {
        So[i].first = N * So[i].first + i;
        S[i] = N * S[i] + i;
    }
    sort(So.begin(),So.end());
    int cnt = 0;
    for(i=0;i<N;i++) {
        if(S[i] == So[i].first) continue;
        P1[cnt] = i;
        P2[cnt] = So[i].second;
        swap(S[i],S[So[i].second]);
        cnt++;
    }
    return cnt;
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:11:12: warning: unused variable 'j' [-Wunused-variable]
   11 |     int i, j;
      |            ^
sorting.cpp:9:41: warning: unused parameter 'M' [-Wunused-parameter]
    9 | int findSwapPairs(int N2, int S2[], int M, int X2[], int Y2[], int P1[], int P2[]) {
      |                                     ~~~~^

• Subtask 1: 0 / 8
• Subtask 2: 0 / 12
• Subtask 3: 0 / 16
• Subtask 4: 0 / 18
• Subtask 5: 0 / 20
• Subtask 6: 0 / 26