Compilare: main.cpp: In function 'int main()': main.cpp:38:56: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &m, &lin_init, &col_init); ^ main.cpp:41:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &mat[i][j]); ^ main.cpp:71:39: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized] else if (sum_total == z && nrelem < t) { ~~~~~~~^~~