Compilare: main.cpp: In function 'int main()': main.cpp:46:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for(int j=sol;j<pr[i].size();j++){ | ~^~~~~~~~~~~~~ main.cpp:49:64: warning: variable 'sol' set but not used [-Wunused-but-set-variable] 49 | int st=0,dr=pr[it].size(),ok=1,sol; | ^~~ main.cpp:66:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for(int j=0;j<pr[i].size();j++){ | ~^~~~~~~~~~~~~ main.cpp:69:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | for(int k=0;k<pr[sd].size();k++){ | ~^~~~~~~~~~~~~~