Compilare: main.cpp: In function 'int main()': main.cpp:94:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 94 | for (j=0; j<v[i].size ()-1; j++) | ~^~~~~~~~~~~~~~~ main.cpp:96:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 96 | while (nr<v[i].size ()-1&&v[i][j]==v[i][j+1]) | ~~^~~~~~~~~~~~~~~