#include <iostream> #include <stdio.h> #include <algorithm> using namespace std; int n, cnt1, cnt2; double a[100001], b[100001]; double ans = -100, sum1, sum2; main(){ cin>>n; for(int i = 0; i < n; i++){ cin>>a[i]>>b[i]; --a[i];--b[i]; } sort(a, a + n); sort(b, b + n); for(int i = n - 1; i >= 0; i--){ sum1+=a[i];cnt1++;cnt2 = 0;sum2 = 0; for(int j = n - 1; j > n - (int)sum1 - 1; j--){ sum2+=b[j]; cnt2++; } ans = max(ans, min(sum1 - cnt2, sum2 - cnt1)); } printf("%.4lf",(double)ans); }

sure.cpp:8:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^