Compilare: main.cpp: In function 'std::vector<int> solve1(std::vector<int>)': main.cpp:16:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i=0;i<arr.size();i++){ | ~^~~~~~~~~~~ main.cpp: In function 'int solve2(std::vector<int>)': main.cpp:27:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | for(int i=0;i<arr.size();i++){ | ~^~~~~~~~~~~ main.cpp:40:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for(int i=0;i<arr.size();i++) | ~^~~~~~~~~~~ main.cpp: In function 'int solve3(std::vector<std::vector<int> >)': main.cpp:46:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for(int line=1;line<mtr.size();line++) | ~~~~^~~~~~~~~~~ main.cpp:47:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(int col=0;col<mtr[0].size();col++) | ~~~^~~~~~~~~~~~~~ main.cpp:51:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int line=0;line<mtr.size();line++){ | ~~~~^~~~~~~~~~~ main.cpp:53:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for(int col=0;col<cline.size();col++) | ~~~^~~~~~~~~~~~~ main.cpp:57:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for(int col=0;col<cline.size();col++) | ~~~^~~~~~~~~~~~~ main.cpp: In function 'int solve4(std::vector<std::vector<bool> >)': main.cpp:65:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | while(line!=know.size() && col !=know[0].size()){ | ~~~~^~~~~~~~~~~~~ main.cpp:65:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | while(line!=know.size() && col !=know[0].size()){ | ~~~~^~~~~~~~~~~~~~~~ main.cpp:66:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | while(line<know.size() and (know[line][col] || line == col))line++; | ~~~~^~~~~~~~~~~~ main.cpp:67:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | if(line<know.size())while(col<know.size() and (!know[line][col] || line==col ))col++; | ~~~~^~~~~~~~~~~~ main.cpp:67:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | if(line<know.size())while(col<know.size() and (!know[line][col] || line==col ))col++; | ~~~^~~~~~~~~~~~ main.cpp:69:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | if(line==know.size())return col; | ~~~~^~~~~~~~~~~~~ main.cpp: In function 'std::string solve5(std::string, int)': main.cpp:79:26: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare] 79 | if(s.top().second==k) | ~~~~~~~~~~~~~~^~~