Compilare: main.cpp: In function 'std::vector<int> solve1(std::vector<int>)': main.cpp:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(int i=0;i<arr.size();i++){ | ~^~~~~~~~~~~ main.cpp: In function 'int solve2(std::vector<int>)': main.cpp:25:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int i=0;i<arr.size();i++){ | ~^~~~~~~~~~~ main.cpp:38:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(int i=0;i<arr.size();i++) | ~^~~~~~~~~~~ main.cpp: In function 'int solve3(std::vector<std::vector<int> >)': main.cpp:44:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for(int line=1;line<mtr.size();line++) | ~~~~^~~~~~~~~~~ main.cpp:45:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for(int col=0;col<mtr[0].size();col++) | ~~~^~~~~~~~~~~~~~ main.cpp:49:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for(int line=0;line<mtr.size();line++){ | ~~~~^~~~~~~~~~~ main.cpp:51:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int col=0;col<cline.size();col++) | ~~~^~~~~~~~~~~~~ main.cpp:55:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for(int col=0;col<cline.size();col++) | ~~~^~~~~~~~~~~~~ main.cpp:56:30: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] 56 | if(mtr[line][col]==col&1)cline[col]=0; main.cpp: In function 'int solve4(std::vector<std::vector<bool> >)': main.cpp:63:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | while(line!=know.size() && col !=know[0].size()){ | ~~~~^~~~~~~~~~~~~ main.cpp:63:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | while(line!=know.size() && col !=know[0].size()){ | ~~~~^~~~~~~~~~~~~~~~ main.cpp:64:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | while(line<know.size() and (know[line][col] || line == col))line++; | ~~~~^~~~~~~~~~~~ main.cpp:65:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | if(line<know.size())while(col<know.size() and (!know[line][col] || line==col ))col++; | ~~~~^~~~~~~~~~~~ main.cpp:65:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | if(line<know.size())while(col<know.size() and (!know[line][col] || line==col ))col++; | ~~~^~~~~~~~~~~~ main.cpp:67:12: 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())return col; | ~~~~^~~~~~~~~~~~~ main.cpp: In function 'std::vector<int> solve6(std::vector<int>, int (*)(int, int), int, int)': main.cpp:92:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]