Compilare: main.cpp: In function 'int main()': main.cpp:20:20: warning: unused variable 'y' [-Wunused-variable] int n, m, x = 0, y, i, j, x1, x2, y1, y2, min1, el; ^ main.cpp:20:51: warning: unused variable 'el' [-Wunused-variable] int n, m, x = 0, y, i, j, x1, x2, y1, y2, min1, el; ^~ main.cpp:18:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rj.in", "r", stdin); ^ main.cpp:19:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rj.out", "w", stdout); ^ main.cpp:22:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d ", &n, &m); ^ main.cpp:61:13: warning: 'y2' may be used uninitialized in this function [-Wmaybe-uninitialized] b[x2][y2] = 1; ~~~~~~~~~~^~~ main.cpp:45:13: warning: 'y1' may be used uninitialized in this function [-Wmaybe-uninitialized] a[x1][y1] = 1; ~~~~~~~~~~^~~ main.cpp:61:13: warning: 'x2' may be used uninitialized in this function [-Wmaybe-uninitialized] b[x2][y2] = 1; ~~~~~~~~~~^~~ main.cpp:45:13: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized] a[x1][y1] = 1; ~~~~~~~~~~^~~