Compilare: main.cpp: In function 'int main()': main.cpp:76:23: warning: unused variable 'x' [-Wunused-variable] int xs, ys, xf, yf, x; ^ main.cpp:73:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("kdrum.in", "r", stdin); ^ main.cpp:74:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("kdrum.out", "w", stdout); ^ main.cpp:77:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ main.cpp:78:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &xs, &ys, &xf, &yf); ^ main.cpp:97:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &xma[i][j]); ^