Compilare: main.cpp:5: warning: ignoring '#pragma gcc optimize' [-Wunknown-pragmas] 5 | #pragma gcc optimize("Ofast") | main.cpp:6: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas] 6 | #pragma GCC optimization("Ofast") | main.cpp:7: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas] 7 | #pragma optimize(Ofast) | main.cpp: In function 'void merge(std::vector<std::pair<int, int> >&, std::vector<std::pair<int, int> >, std::vector<std::pair<int, int> >)': main.cpp:45:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for( i = 0; i < a.size(); ++i ) { | ~~^~~~~~~~~~ main.cpp:46:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | while( ( ( j + 1 ) < b.size() ) && b[ j + 1 ].first <= a[ i ].second ) | ~~~~~~~~~~^~~~~~~~~~ main.cpp:48:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | if( ( j + 1 ) == b.size() && b[ j ].second < a[ i ].second ) | ~~~~~~~~~~^~~~~~~~~~~ main.cpp:57:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for( ; i < a.size(); ++i ) | ~~^~~~~~~~~~ main.cpp:60:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for( ; j < b.size(); ++j ) | ~~^~~~~~~~~~