Compilare: main.cpp: In function 'int main()': main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int c = 0; c < v.size(); ++c){ ~~^~~~~~~~~~ main.cpp:16:24: warning: 'y2' may be used uninitialized in this function [-Wmaybe-uninitialized] return x < x1 || y < y1; ~~^~~~ main.cpp:55:25: note: 'y2' was declared here int x1, y1, x2, y2; ^~ main.cpp:16:14: warning: 'x2' may be used uninitialized in this function [-Wmaybe-uninitialized] return x < x1 || y < y1; ~~^~~~ main.cpp:55:21: note: 'x2' was declared here int x1, y1, x2, y2; ^~ main.cpp:16:24: warning: 'y1' may be used uninitialized in this function [-Wmaybe-uninitialized] return x < x1 || y < y1; ~~^~~~ main.cpp:55:17: note: 'y1' was declared here int x1, y1, x2, y2; ^~ main.cpp:16:14: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized] return x < x1 || y < y1; ~~^~~~ main.cpp:55:13: note: 'x1' was declared here int x1, y1, x2, y2; ^~