Compilare: user.cpp: In function ‘void idem()’: user.cpp:87:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < principal.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:131:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < principal.size(); i++) { ^ user.cpp:138:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < principal.size(); i++) { ^ user.cpp:157:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < principal.size(); i++) { ^ user.cpp:159:46: warning: narrowing conversion of ‘i’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] sorted[size++] = (pair){power[i], i}; ^ user.cpp:119:10: warning: unused variable ‘j’ [-Wunused-variable] int i, j, find; ^