Compilare: main.cpp: In function 'int main()': main.cpp:30:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(int i=0;i<a[x].size();i++) | ~^~~~~~~~~~~~ main.cpp:50:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(int i=0;i<a[x].size();i++) | ~^~~~~~~~~~~~ main.cpp:59:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 59 | for(int i=1;i<=n;i++) | ^~~ main.cpp:62:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 62 | cout<<rez<<endl; | ^~~~