Compilare: main.cpp: In function 'void remove_grad(int)': main.cpp:14:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j <= muchii.size(); j++) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:24:18: warning: unused variable 'j' [-Wunused-variable] int n, m, i, j, s = 0; ^ main.cpp:24:21: warning: unused variable 's' [-Wunused-variable] int n, m, i, j, s = 0; ^