Compilare: main.cpp: In function 'void writeSolution()': main.cpp:97:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < solution.size(); ++i ) { ~~^~~~~~~~~~~~~~~~~ main.cpp:104:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < solution.size(); ++i ) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'long long int searchSolution()': main.cpp:57:9: warning: 'candidate' may be used uninitialized in this function [-Wmaybe-uninitialized] return candidate; ^~~~~~~~~