Compilare: main.cpp: In function 'int main()': main.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int j=0; j<len(i); j++) | ^ main.cpp:38:53: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 38 | if(dif + len(i) >= NMAX || dif - len(i) <= -NMAX) continue; | ~~~~~~~~~~~~~^~~~~~~~ main.cpp:39:74: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if(cost[NMAX + dif + len(i)]==0 || cost[NMAX + dif + len(i)] > c + len(i)) | ^ main.cpp:44:74: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | if(cost[NMAX + dif - len(i)]==0 || cost[NMAX + dif - len(i)] > c + len(i)) | ^