Compilare: main.cpp: In function 'bool check(int)': main.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[i].size() < l) ~~~~~~~~~~~~^~~ main.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j + l<= s[i].size() ;j++) ~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:42:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i = 1; i <= n; i++) ^~~ main.cpp:44:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' int l = 2; ^~~