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- #include <iostream>
- using namespace std;
- int main(){
- int n;
- cin>> n;
- int ad[n][2], i=0, j;
- while(i<n){
- j=0;
- while(j<2){
- cin>> ad[i][j];
- ++j;
- }
- ++i;
- }
- int i1=0, j1=0, i2=1, j2=1;
- int v=0;
- while(true){
- if(ad[i1][j1]<ad[i2][j2]){
- j2=0;
- if(ad[i1][j1]>ad[i2][j2]){
- v++;
- if(i2==n-1){
- if(i1==i2){
- break;
- }
- else{
- i1++; i2=0; j2=1;
- }
- }
- else{
- i2++; j2=1;
- }
- }
- else{
- if(i2==n-1){
- if(i1==i2)
- break;
- else{
- i1++; i2=0; j2=1;
- }
- }
- else{
- i2++; j2=1;
- }
- }
- }
- else{
- if(i2==n-1){
- if(i1==i2)
- break;
- else{
- i1++; i2=0; j2=1;
- }
- }
- else
- i2++;
- }
- }
- cout<<(v+n)*2;
- }
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