Compilare: main.cpp: In function 'int main()': main.cpp:50:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( k = 0; k < vec[j].size ( ); k++ ){ ~~^~~~~~~~~~~~~~~~~ main.cpp:68:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( k = 0; k < vec[i].size ( ); k++ ){ ~~^~~~~~~~~~~~~~~~~ main.cpp:73:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( k = 0; k < vec[i].size ( ); k++ ){ ~~^~~~~~~~~~~~~~~~~ main.cpp:26:38: warning: unused variable 'l' [-Wunused-variable] int mod[] = { 0, -m, 1, m, -1 }, l = 0, MAX = n * m, Height = 0; ^