Compilare: main.cpp: In function 'int main()': main.cpp:24:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(st<s.size()&&dr<s.size()) ~~^~~~~~~~~ main.cpp:24:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(st<s.size()&&dr<s.size()) ~~^~~~~~~~~ main.cpp:35:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(dr<s.size()&&nrdif<=c) ~~^~~~~~~~~ main.cpp:45:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dr==s.size()) ~~^~~~~~~~~~ main.cpp:55:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dr-st+1>sol.size()) ~~~~~~~^~~~~~~~~~~ main.cpp:63:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dr-st+1>sol.size()) ~~~~~~~^~~~~~~~~~~ main.cpp:66:14: warning: variable 'ok' set but not used [-Wunused-but-set-variable] bool ok=0; ^~