Compilare: user.cpp: In function ‘void idem()’: user.cpp:85:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < principal.size(); i++) { ^ user.cpp: In function ‘void afis(std::vector<std::basic_string<char> >&)’: user.cpp:119:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:138:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < principal.size(); i++) { ^ user.cpp:145:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; (i < principal.size()) && (find == 0); i++) { ^ user.cpp:162:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < principal.size(); i++) { ^ user.cpp:172:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < principal.size(); j++) { ^ user.cpp:180:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < principal.size(); i++) { ^ user.cpp:182:46: warning: narrowing conversion of ‘i’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] sorted[size++] = (pair){power[i], i}; ^