Compilare: main.cpp: In function 'int sum(int)': main.cpp:15:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int j=0;j<v[i].fi.size();j++) | ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:13: warning: 'strt' may be used uninitialized [-Wmaybe-uninitialized] 47 | strt=sum(strt); | ~~~^~~~~~ main.cpp:41:9: note: 'strt' was declared here 41 | int strt; | ^~~~