//#include "sorting.h"
#include <bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
int n;
vector <int> s,x,y,p,q;
int ans = 0;
void merge(int l, int r, int mid){
vi a;
vi b;
for(int i = l; i<=mid; i++) a.push_back(s[i]);
for(int i = mid+1; i<=r; i++) b.push_back(s[i]);
int i = 0, j = 0, k = l;
while(i<=mid-l and j<=r-(mid+1)){
if(a[i]>b[j]){
if(k != j+mid+1){
swap(s[x[ans]],s[y[ans]]);
p[ans] = k; q[ans] = j+mid+1;
ans++;
}
s[k] = b[j]; j++; k++;
}
else{
if(k != i+l){
swap(s[x[ans]],s[y[ans]]);
p[ans] = k; q[ans] = i+l;
ans++;
}
s[k] = a[i]; i++; k++;
}
}
while(i<=mid-l){
if(k != i+l){
swap(s[x[ans]],s[y[ans]]);
p[ans] = k; q[ans] = i+l;
ans++;
}
s[k] = a[i]; i++; k++;
}
while(j<=r-(mid+1)){
if(k != j+mid+1){
swap(s[x[ans]],s[y[ans]]);
p[ans] = k; q[ans] = j+mid+1;
ans++;
}
s[k] = b[j]; j++; k++;
}
}
void separate(int l, int r){
if(l<r){
int mid = (l+r)>>1;
separate(l,mid);
separate(mid+1,r);
merge(l,r,mid);
}
}
int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
if(N == 1){
P[0] = 0;
Q[0] = 0;
return 1;
}
n = N;
for(int i = 0; i<n; i++) s.push_back(S[i]);
for(int i = 0; i<M; i++) x.push_back(X[i]), y.push_back(Y[i]);
p.assign(M,0);
q.assign(M,0);
int ind1 = 0, ind2 = 0; int mn = INT_MAX;
for(int i = 0; i<N; i++){
if(s[i]<mn){
mn = s[i];
ind1 = i;
}
}
if(ind1 > 0){
swap(s[x[ans]],s[y[ans]]);
p[ans] = 0; q[ans] = ind1;
swap(s[0],s[ind1]); ans++;
}
int indx = -1;
if(x[ans]==y[ans]){
indx = 1;
}
else indx = 0;
mn = INT_MAX;
for(int i = 1; i<n; i++){
if(s[i]<mn){
mn = s[i]; ind2 = i;
}
}
if(ind2>1){
swap(s[x[ans]],s[y[ans]]);
swap(s[indx],s[ind2]); p[ans] = min(indx,ind2); q[ans] = max(indx,ind2);ans++;
}
//separate(2,n-1);
for(int i = 2; i<n; i++){
for(int j = i+1; j<n; j++){
if(s[i]>s[j]){
swap(s[x[ans]],s[y[ans]]);
if(s[i]>s[j]) swap(s[i],s[j]), p[ans] = i, q[ans] = j;
else p[ans] = i, q[ans] = i;
ans++;
}
}
}
if(s[0]>s[1]){
swap(s[x[ans]],s[y[ans]]);
if(s[0]>s[1]){
swap(s[0],s[1]);
p[ans] = 0; q[ans] = 1; ans++;
}
else p[ans] = 0, q[ans] = 0, ans++;
}
for(int i = 0; i<M; i++) P[i] = p[i], Q[i] = q[i];//, cout<<p[i]<<" "<<q[i]<<endl;
return ans;
}
int main(){
int s [] = {0,1,3,2};
int x [] = {0,0,1,0,0,0};
int y [] = {1,0,0,0,1,0};
int p [] = {0,0,0,0,0,0};
int q [] = {0,0,0,0,0,0};
cout<<findSwapPairs(4,s,6,x,y,p,p);
return 0;
}
Compilation message
sorting.cpp: In function 'int main()':
sorting.cpp:135:6: warning: declaration of 's' shadows a global declaration [-Wshadow]
135 | int s [] = {0,1,3,2};
| ^
sorting.cpp:9:14: note: shadowed declaration is here
9 | vector <int> s,x,y,p,q;
| ^
sorting.cpp:136:6: warning: declaration of 'x' shadows a global declaration [-Wshadow]
136 | int x [] = {0,0,1,0,0,0};
| ^
sorting.cpp:9:16: note: shadowed declaration is here
9 | vector <int> s,x,y,p,q;
| ^
sorting.cpp:137:6: warning: declaration of 'y' shadows a global declaration [-Wshadow]
137 | int y [] = {1,0,0,0,1,0};
| ^
sorting.cpp:9:18: note: shadowed declaration is here
9 | vector <int> s,x,y,p,q;
| ^
sorting.cpp:138:6: warning: declaration of 'p' shadows a global declaration [-Wshadow]
138 | int p [] = {0,0,0,0,0,0};
| ^
sorting.cpp:9:20: note: shadowed declaration is here
9 | vector <int> s,x,y,p,q;
| ^
sorting.cpp:139:6: warning: declaration of 'q' shadows a global declaration [-Wshadow]
139 | int q [] = {0,0,0,0,0,0};
| ^
sorting.cpp:9:22: note: shadowed declaration is here
9 | vector <int> s,x,y,p,q;
| ^
sorting.cpp:139:6: warning: unused variable 'q' [-Wunused-variable]
139 | int q [] = {0,0,0,0,0,0};
| ^
/usr/bin/ld: /tmp/ccYuqFni.o: in function `main':
grader.c:(.text.startup+0x0): multiple definition of `main'; /tmp/ccYGzYrh.o:sorting.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
