Compilare: main.cpp: In function 'int main(int, const char**)': main.cpp:49:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d\n", &n, &m) ; ^ main.cpp:89:7: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] if (j < y) { ^~ main.cpp:88:13: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] } else if (i == x) { ^~