Submission #206036

#	Time	Username	Problem	Language	Result	Execution time	Memory
206036		Segtree	Sorting (IOI15_sorting)	C++14	20 / 100	1089 ms	376 KiB

sorting

#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
using namespace std;
typedef long long ll;
#define chmin(a,b) a=min(a,b)
#define chmax(a,b) a=max(a,b)
#define all(x) x,begin(),x.end()
#define rep(i,n) for(int i=0;i<n;i++)
#define mod 1000000007
#define mad(a,b) a=(a+b)%mod
int findSwapPairs(int N,int S[],int M,int X[],int Y[],int P[],int Q[]){
	int ss[2010];
	rep(i,N)ss[i]=S[i];
	int R=0;
	for(;;R++){
		swap(S[X[R]],S[Y[R]]);
		ll cnt=0,s[2010];
		rep(i,N)s[i]=S[i];
		//cout<<R<<"-";rep(i,N)cout<<"S:"<<s[i]<<endl;
		rep(i,N){
			ll p;
			rep(j,N)if(i==s[j])p=j;
			if(i!=p){
				cnt++;
				swap(s[i],s[p]);
			}
		}
		if(cnt<=R+1){
			int R=0;
			for(int i=0;i<N;i++){
				ll p;
				for(int j=0;j<N;j++)if(S[j]==i)p=j;
				if(i!=p){
					P[R]=i,Q[R]=p,R++;
					swap(S[i],S[p]);
				}
			}
			return R;
		}
	}
	return -1;
}/*
int main(){
	int n,s[100],m,x[1000],y[1000],p[1000],q[1000];
	cin>>n;
	rep(i,n)cin>>s[i];
	cin>>m;
	rep(i,m){
		cin>>x[i]>>y[i];
	}
	ll R=findSwapPairs(n,s,m,x,y,p,q);
	cout<<"R="<<R<<endl;
	rep(i,R)cout<<"PQ:"<<p[i]<<" "<<q[i]<<endl;
}*/

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:31:8: warning: declaration of 'R' shadows a previous local [-Wshadow]
    int R=0;
        ^
sorting.cpp:16:6: note: shadowed declaration is here
  int R=0;
      ^
sorting.cpp:36:18: warning: conversion to 'int' from 'll {aka long long int}' may alter its value [-Wconversion]
      P[R]=i,Q[R]=p,R++;
                  ^
sorting.cpp:14:6: warning: variable 'ss' set but not used [-Wunused-but-set-variable]
  int ss[2010];
      ^~
sorting.cpp:13:37: warning: unused parameter 'M' [-Wunused-parameter]
 int findSwapPairs(int N,int S[],int M,int X[],int Y[],int P[],int Q[]){
                                     ^
sorting.cpp:35:5: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(i!=p){
     ^~
sorting.cpp:25:4: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
    if(i!=p){
    ^~

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