Compilare: main.cpp: In function 'void display(Vec<Vec<int> >&)': main.cpp:139:20: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 139 | for(int ii=1;ii<ma.size();ii++) { | ~~^~~~~~~~~~ main.cpp:140:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 140 | for(int j=1;j<ma[ii].size();j++) { | ~^~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:171:26: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 171 | for(int j=1;j<C.size();j++) { | ~^~~~~~~~~