Compilare: main.cpp: In function 'void read()': main.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < mes.length(); i++) ~~^~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:50:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < min(a[0].size(), a[i].size()); j++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:54:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < min(a[0].size(), a[idx].size()); i++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:75:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++){ ~~^~~~~~~~~~