Compilare: main.cpp:2:91: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] using namespace std;ifstream cin("fsb.in");ofstream cout("fsb.out");int cate[400001];main(){int sol = 0,contor = 200001,i,n;char x;cin >> n;cate[contor] = 1;for(i = 1;i <= n;i++){cin >> x;if(x == '0')contor--;else contor++;sol += cate[contor],cate[contor]++;}cout << sol;} ^